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NOTA BENE:

Vortices and Columnar Defects

The motion of flux-line lattices in various single crystals of NbSe2 has been observed by A. M. Troyanovskii (Leiden and IHPP-Moscow) et al. using fast scanning tunneling microscopy (STM). The total acquisition time to acquire one image (400 nm x 400 nm and 128 lines) was about 10 s. In crystals with weak point disorder (point pinning), slow collective motion of a large bundle of vortices was seen along one of the principal directions of the flux-line lattice. The longitudinal velocity was found to be modulated with a periodic component related to the vortex lattice parameter, while the transverse center-of-mass displacements were random. In crystals with strong line disorder (correlated pinning) caused by columnar defects produced via fast ion irradiation, collective pinning was observed in fields up to almost double the dose-equivalent field B_[phi] = 0.3 T, while interesting plastic-flow patterns were detected at 2B_[phi]. Movies of such vortex motion can be accessed at the web site http://rulgm5.leidenuniv.nl/~msm/msmain using the link Selected new results.

Reversible magnetization measurements by R. J. Drost (Leiden) et al. show that the pinning energy of vortices localized on amorphous tracks created in Bi2Sr2CaCu2O8+d (Bi-2212) single crystals by heavy-ion irradiation can be adjusted by altering the irradiation angle. The pinning energy is found to be proportional to the cross-sectional area of the defects in the CuO2 planes. Both this size dependence and the observed quadratic temperature dependence of the pinning energy imply a predominant vortex core pinning interaction of pancake vortices with columnar defects, as opposed to an electromagnetic pinning mechanism. The authors also present an independent determination of the value of the Ginzburg-Landau coherence length.

The angular dependence of the irreversible magnetization of YBa2Cu3O7-d (YBCO) crystals with columnar defects inclined from the c axis has been analyzed by A. Silhanek (Bariloche) et al. At high fields, the authors observed a sharp maximum centered on the track direction. At low fields, the authors identified a lock-in phase characterized by an angle-dependent pinning strength, and they found an angular shift of the peak towards the c axis. The interplay among columnar defects, twins, and ab planes generates a variety of staircase structures. The authors show that correlated pinning dominates for all field orientations.

A preprint by G. Pasquini (Buenos Aires) et al. reports the use of ac susceptibility measurements to explore the dynamic response of vortices in YBCO single crystals pinned by aligned columnar defects in low dc magnetic fields. Using a combination of techniques for the analysis of the data, the authors investigate the vortex motion as a function of amplitude and frequency of the applied ac field h_[ac], identifying the influence of both intra- and inter-valley motion. The authors build up a dynamic diagram in the h_[ac] vs T plane, indicating the crossover lines among several regimes in the vortex-solid phase. At low h_[ac], a linear response with very low dissipation arises from the oscillation of pinned vortices inside the tracks (Campbell regime), while at high h_[ac], a critical state develops.

Vortex-motion noise in epitaxial YBa2Cu3O7-d (YBCO) films in magnetic fields before and after the introduction of columnar defects via heavy- ion irradiation has been studied by D. H. Kim (Argonne and Yeungnam) et al. The authors found that irradiation resulted in an increase in the noise-peak height. The authors attribute this increase to a larger vortex bundle size, probably due to an increased length of vortex segments arising from interactions with pinned vortices in columnar defects.

The surface resistance R_s of YBCO thin films containing columnar defects produced upon irradiation by 0.9 GeV Pb ions has been measured by J. Wosik (TCSUH) et al. At low temperatures, no significant difference was observed between the surface resistance of irradiated and unirradiated films. At higher temperatures, however, the irradiated films exhibited not only a higher R_s but also a nonlinear dependence of R_s on magnetic field. The authors model the behavior in terms of additional losses and/or heating effects in the insulator/superconductor boundary between the amorphous core of the columnar defect (a few nm in diameter) and the surrounding superconducting material.

More Vortices

Using a miniature two-coil mutual-inductance technique, Y. Ando (CRIEPI) and K. Nakamura (CRIEPI and Tokyo Tech) have investigated the linear ac response of the vortex system locally in Bi2Sr2CaCu2O8+d (Bi-2212) crystals at various doping. The authors found that a step-like change in the local ac response takes place exactly at the first-order transition (FOT) temperature T_[FOT](H) determined by a global dc magnetization measurement. The T_[FOT](H) becomes steeper with increasing doping. In the higher-field region where the FOT is not observed, the local ac response still shows a broadened but distinct feature, which can be interpreted as marking the growth of short-range order in the vortex system.

As reported by M. Nohara (Tokyo and CREST) et al., the quasiparticle density of states (DOS) in the vortex state has been probed by specific- heat measurements in a magnetic field H for clean and dirty superconductors Y(Ni1-xPtx)B2C and Nb1-xTaxSe2. The authors find that the quasiparticle DOS per vortex is H-dependent in the clean limit, while it is H-independent in the dirty limit. The authors suggest that their results may be understood in terms of shrinking of the vortex-core radius with increasing magnetic field.

The vortex-lattice structure in an orthorhombic d-wave superconductor in a magnetic field parallel to the c axis has been studied theoretically by Q. Han and L. Zhang (Peking). As the temperature decreases, the authors predict a second-order phase transition, at which the lattice structure should change from a body-centered rectangular lattice elongated along the b-axis direction, but with no rotation relative to the underlying crystal, to a rectangular lattice elongated along the a- axis direction. The authors' theory cannot explain the experimentally observed vortex lattice.

Using an array of miniature Hall probes, K. Behnia (Orsay) et al. have monitored the temporal variation of magnetic-field profiles in a superconducting Nb sample during slow sweeps of the external magnetic field. The authors found that a sizable fraction of the increase in the local vortex population occurs in abrupt jumps. The size distribution of these avalanches is described by a power law over a limited range. In contrast, at low temperatures and low fields, huge avalanches with a typical size occur, and the system does not display a well-defined macroscopic critical current.

The time-dependent Ginzburg-Landau equations (TDGL) have been solved by M. Ghinovker (Bar-Ilan) et al. for the case of a type-II superconductor cooled through Tc into its superconducting state in the presence of a small magnetic field. The authors find numerically that the restoration of superconductivity is accompanied by the nucleation of both vortices and antivortices. The authors find that when pinning centers are present, a state consisting of physically separated vortices and antivortices can persist for a long time.

Studies of the dc magnetization of thin, platelike samples of the isotropic type-II superconductor PbTl(10%) have been carried out by S. Candia and L. Civale (Bariloche) as a function of the angle between the normal to the sample and the applied magnetic field H. The authors determined the magnetization vector M by measuring the components both parallel and normal to H in a SQUID magnetometer, and they further decomposed M into its reversible and irreversible contributions.

A preprint by I. M. Obaidat et al. (UIC) reports magnetization measurements in which a YBa2Cu3O7-d crystal was cooled to 4.2 K in a magnetic field H along the c axis, and then was tilted such that the angle theta between H and the c axis varied from 0 degree to 180 degrees. The authors measured the magnetization M of the crystal vs theta and found evidence for the entry of antivortices into the sample.

A preprint by V. M. Krasnov (Goeteborg and ISSP-Chernogolovka) reports the derivation of an approximate analytic solution for the gauge- invariant phase differences and the local magnetic fields generated by a single fluxon in one of the two Josephson junctions in double stacked Josephson junctions (SJJ's). The author derives the approximate solution for arbitrary junction parameters and coupling strengths, and analyzes the accuracy using perturbation theory.

An extension of the above work is described in a preprint by V. M. Krasnov (Goeteborg and ISSP-Chernogolovka) and D. Winkler (Goeteborg), who study numerically and analytically the shape of single fluxons moving at high speeds in double stacked Josephson junctions (SJJ's) for various junction parameters. The authors find that the fluxons can be characterized by two components, with different Swihart velocities and Josephson penetration depths. The authors find that such fluxons may have an unusual shape with an inverted magnetic field in the second junction when the velocity of the fluxon is approaching the lower Swihart velocity. The authors also study the influence of fluxon shape on the flux-flow current-voltage characteristics, and they analyze the spectrum of Cerenkov radiation for fluxon velocities above the lower Swihart velocity.

RBa2Cu3O7-d

The first-order melting transition of the flux-line lattice in a twinned NdBa2Cu3O7-d (NBCO) single crystal grown under low oxygen partial pressure has been observed by A. K. Pradhan et al. (SRL-ISTEC) via transport measurements (a kink in the resistance vs temperature). The authors report that the melting transition is distinctly observed for oxygen partial pressures up to 0.05% during growth and that the transition becomes continuous for higher oxygen pressures. Crystals showing the first-order melting transition do not show a peak effect in Jc vs B, but a significant peak effect develops for crystals grown under oxygen pressures greater than 0.06%.

Binary (Nd,Sm)Ba2Cu3O7-d [(Nd,Sm)-123] single-grain bulk superconductors with Tc = 96 K and a high irreversibility field up to 8 T at 77 K have been fabricated in air by A. Hu et al. (Dresden) using a newly developed technique. The initial composition was controlled by using binary (Nd,Sm)2BaO4 as an addition. The authors found that the present composition yielded critical current densities in the intermediate field regime (1-3 T) larger than those of melt-textured NdBa2Cu3O7-d and YBa2Cu3O7-d. Microstructural and compositional analysis showed that the Nd and Sm distributions in the (Nd,Sm)-123 matrix were homogeneous, but that the atomic ratio of Nd to Sm was different from that in the nominal composition. The authors suggest that this is due to the different solubilities of Nd and Sm in the liquid phase.

Bi Cuprates

The anisotropic resistivities of Bi2Sr2Ca1-xErxCu2O8+d single crystals have been measured and analyzed from 4.2 K to 500 K by T. Kitajima et al. (Waseda), with a focus on the parent antiferromagnetic insulator, x = 1.0. Although the resistivity is semiconducting along both the in- plane and out-of-plane directions, the ratio rho_c(T)/rho_[ab](T) is not a constant; this ratio has a broad maximum near room temperature for x = 1.0. The authors propose that confinement in the CuO2 plane is at work in the two-dimensional spin-fluctuation regime regardless of the doping level.

Transport ac losses in silver-sheathed (Bi,Pb)2Sr2Ca2Cu3O10+d [(Bi,Pb)- 2223] multifilamentary tape in the form of a helix with a 3 mm gap between the turns have been measured by M. Majoros (IRC-Cambridge and Bratislava) et al. in the frequency range 40-125 Hz. The authors found that the apparent losses depend upon the positions of the potential taps and placement of the voltage leads. The authors report that various arrangements measure different contributions to the total losses.

The effects of low oxygen partial pressure and high Pb doping in Bi2.2- xPbxSr2CaCu2O8+d [(Bi,Pb)-2212] have been investigated experimentally by A. L. Crossley et al. (Imperial). The Pb additions resulted in an increase in the intragranular flux pinning at temperatures above 40 K.

Electron-tunneling spectroscopy of pure, Ni-doped, and Zn-doped Bi2Sr2CaCu2O8+d (Bi-2212) has been carried out by A. Mourachkine (Brussels) using a break-junction technique. To explain the data, the author introduces a model involving spinon superconductivity along charge stripes, with coherence among stripes being established by spin waves perpendicular to the stripes.

La2-xSrxCuO4

A preprint by S. Wakimoto (Brookhaven and Tohoku) et al. describes neutron-scattering experiments on lightly doped La2-xSrxCuO4 (LSCO) single crystals in both the insulating (x = 0.03, 0.04, and 0.05) and superconducting (x = 0.06) regions. The authors observed elastic magnetic peaks at low temperatures in all samples, with the maximum peak linewidth occurring at the critical concentration x_c = 0.05. New incommensurate peaks were observed only at x = 0.05, and their positions were rotated by 45 degrees in reciprocal space about (pi,pi) from those observed for x >= 0.06 in the superconducting phase.

Using a combination of ac susceptibility and muon spin relaxation (muSR), C. Panagopoulos (IRC-Cambridge) et al. have measured the absolute values of the in-plane magnetic penetration depth lambda_[ab] of La2-xSrxCuO4 (LSCO) and HgBa2CuO4+d (Hg-1201) as a function of temperature and carrier concentration. In the overdoped region, the authors found that the zero-temperature superfluid density rho_s(0) is approximately constant and that rho_s(T)/rho_s(0) is in reasonably good agreement with the weak-coupling d-wave temperature dependence. In the optimal and underdoped regions, however, rho_s(0) is rapidly suppressed and there is a marked departure of rho_s(T)/rho_s(0) from the weak- coupling curve. The authors point out a possible correlation between rho_s and the normal-state energy gap (pseudogap).

Hg Cuprates

As stressed in a preprint by J. A. Wilson and M. Farbod (Bristol), Seebeck data provide valuable information on high-temperature superconducting (HTS) materials over a wide doping range. The authors closely examine Seebeck thermoelectric results from HgBa2CuO4+d (Hg- 1201) in an effort to understand the normal-state behavior and the approach to superconductivity. The authors discuss the generality of the Seebeck data in all HTS systems, and they expand the pseudogap treatment of G. Hildebrand et al. [Phys. Rev. B 56, R4317 (1997)] to incorporate stripe-phase behavior and a principally electronic negative- U approach to HTS. The authors discuss pseudogap formation in light of recent angle-resolved photoelectron spectroscopy (ARPES) and tunneling results. The paper emphasizes the importance of the following aspects to the mechanism of superconductivity in the cuprates: two- dimensionality, square-planar geometry, saddle points, two-subsystem mixed-valent organization, and resonant shell-filling-driven negative-U fluctuations.

A closely related paper by M. Farbod et al. (Bristol) reports an examination of the Seebeck behavior of HgBa2CuO4+d (Hg-1201). The authors report that this system, whether stoichiometric or Hg-deficient, appears to behave in a fashion similar to the La2-xSrxCuO4 and YBa2Cu3O7-d systems in that a dip in Tc(p) appears at p ~ 1/8 (p = hole count). The authors take this concentration of holes to mark the point at which stripe-phase formation in the organization of charge and spin in the two-subsystem, mixed-valent, HTS materials changes from one charge-wall-loading scheme to another.

Junctions

The effect of a magnetic field upon the Josephson critical current of a junction between two d-wave superconductors has been investigated theoretically by X.-Z. Yan (Texas A&M and Beijing) and C.-R. Hu (Texas A&M). The authors find that when the crystal orientation of one (or each) superconductor relative to the interface normal is such that midgap states exist at the interface, there is a component of the tunneling current due to the midgap states. For a junction with a flat {001}/{110} or {100}/{110} interface, this component makes the predominant contribution to the current. The predicted current vs field dependence differs significantly from the conventional Frauenhofer pattern and is in agreement with recent measurements by Y. Ishimaru et al. [Phys. Rev. B 55, 11851 (1997)] on YBCO junctions. This occurs because the critical current depends upon not only the Frauenhofer factor but also the current density, which is a linear function of B for weak B.

The dc Josephson current in unconventional superconductor / ferromagnet / unconventional superconductor (S/F/S) junctions has been studied theoretically by Y. Tanaka (Nagoya) and S. Kashiwaya (ETL). The authors find that when both superconductors have d-wave symmetry, the Josephson current is drastically suppressed as the exchange interaction increases. On the other hand, when the two superconductors have different parities (e.g., s-wave and p-wave), the Josephson current increases as the exchange interaction increases.

A preprint by Y. Tanaka (Nagoya) et al. presents a theory for the Josephson effect in an unconventional superconductor / one-dimensional electron gas / unconventional superconductor (S/O/S) junction, where the Josephson current is carried by components injected perpendicular to the interface. The authors find that when the superconductors on both sides have triplet symmetry, the Josephson current is enhanced at low temperature because of zero-energy states formed near the interface. The authors suggest that the parity of the superconductor can be identified by measuring the Josephson current in an S/O/S junction.

The nonequilibrium current noise in voltage-biased short disordered superconductor / normal-metal / superconductor (S/N/S) Josephson junctions has been calculated by Y. Naveh and D. V. Averin (SUNY-Stony Brook) within the scattering theory of multiple Andreev reflections. The predicted noise exhibits subharmonic gap structure, "quantization" of the effective charge q*, a pronounced zero-temperature singularity at low bias voltages, and excess noise at large voltages.

YBa2Cu3O7-d (YBCO) artificial grain-boundary Josephson junctions have been fabricated by F. Tafuri (Napoli) et al. by controlling the orientation of the MgO seed layer, which results in 45-degree tilt and twist boundaries. The authors found that the tilt and twist boundaries exhibited significant differences in their Josephson properties.

The phase-dependent differential thermopower of s-wave superconductor / normal-metal / d-wave superconductor (S/N/D) junctions has been calculated by S. Sergeenkov and M. Ausloos (Liege). The authors discuss the experimental conditions under which predicted behavior could be measured.

Films

The B-T phase diagram for thin-film YBa2Cu3O7-d (YBCO) with B parallel to the superconducting layers has been constructed by J. L. O'Brien (New South Wales) et al. from GHz transport measurements to 150 T. The authors find evidence for a transition from a high-T regime, dominated by orbital effects, to a low-T regime, where paramagnetic limiting drives the quenching of superconductivity. Up to 110 T, the upper critical field is found to be linear in T and in remarkable agreement with extrapolation of magnetization measurements up to 6 T by U. Welp et al. [Phys. Rev. Lett. 62, 1908 (1989)]. Beyond this, however, a departure from linear behavior occurs at T = 74 K, where a 3D-2D crossover is expected to occur.

A simple technique for the growth of ribbonlike single-crystalline films of Bi2Sr2CaCu2O8+d (Bi-2212) on Ag substrates has been developed by S. Arisawa (NRIM and CREST) et al. The films were produced under ambient pressure by melting Bi-2212 powder on the substrate. The ribbons were found to be extremely thin (~1 micrometer) and to stick firmly to the substrate. The ribbonlike films showed superconducting transitions with an onset temperature of ~80 K.

The normal-state and superconducting properties of La1.85Sr0.15CuO4 (LSCO) thin films have been measured by W. Si et al. (Penn State) as a function of lattice strain and oxygen content. The authors report that both full oxygenation and compressive in-plane strain are critical for the properties of these films.

The field and angular dependencies of the resistive broadening of epitaxial (YBa2Cu3O7-d)24/(PrBa2Cu3O7-d)2 multilayer thin films have been measured by Z. H. Wang (Shanghai) et al. The results for the activation energy U and the characteristic temperature T* can be scaled by the 2D model proposed by P. H. Kes et al. [Phys. Rev. Lett. 64, 267 (1990)].

Applications

A preprint by E. Broide (Separator Ltd.) reports an experimental investigation of the abnormally high sensitivity to low-power impulse electromagnetic radiation (IEMR) in systems that include a sensing element consisting of a resonant circuit with a secondary coil and a high-temperature superconductor (HTS) core. The core was produced using epoxied composites containing HTS powder [YBa2Cu3O7-d and (Bi,Pb)2Sr2Ca2Cu3O10+d]. The author suggests the possibility of applications in small antennas operating at the temperature of liquid nitrogen.

Theory

Laser pump/probe experiments by C. J. Stevens et al. [Phys. Rev. Lett. 78, 2212 (1997)] on YBa2Cu3O7 and thermomodulation optical data and analysis by M. J. Holcomb et al. [Phys. Rev. B 53, 6734 (1996)] on a selection of HTS materials have been theoretically examined by J. A. Wilson (Bristol). The work centers on universal 1.5 eV - 2 eV features that appear below Tc. The author argues that these are not simple p-to- d band-to-band excitations but instead are associated with the mixed- valent and negative-U states that are responsible for the high- temperature superconductivity.

An explanation of the negative isotope effect observed for Cu in underdoped YBa2Cu3O7-d is proposed in a preprint by A. A. Abrikosov (Argonne). The author shows that such an effect can be due to scattering of electrons from low-frequency phonons that are not associated with oscillations of the total ionic charge density. The negative isotope effect is specific to superconducting layered cuprates with a d-wave order parameter and is absent in s-wave superconductors. Although the theory does not reproduce all observed features of the dependence of the isotope effect on oxygen concentration, it agrees qualitatively with the general trend of enhancement with decreasing Tc.

Calculations of the optical conductivity for a two-dimensional system using a simple model of the electronic spectrum with "hot patches" on the Fermi surface, with non-Fermi-liquid renormalization of the spectral density (pseudogap) on these patches, have been carried out by M. V. Sadovskii (Ekaterinburg). The author shows that this model qualitatively reproduces basic anomalies of optical experiments in the pseudogap state of the cuprates.

A preprint by D.-H. Lee (UC-Berkeley) takes the point of view that at short distances and high energies, the undoped and underdoped cuprates resemble the pi-flux phase of the t-J model. The author presents a mechanism by which pairing grows out of the doped pi-flux phase, and pairing symmetry is determined by a parameter controlling the quantum tunneling of gauge flux quanta. For zero tunneling, the symmetry is d_[x^2-y^2] + id_[xy], while for large tunneling it is d_[x^2-y^2]; a zero-temperature critical point separates these two limits.

Two preprints by M. Matsumoto (Shizuoka) and M. Sigrist (Shizuoka and Kyoto) theoretically explore ways of probing the possibility of p_x +- ip_y order-parameter symmetry in superconducting Sr2RuO4. One of the preprints examines chiral optical absorption by a single vortex. Because there are two types of vortices, with winding orientations the same as or opposite to the angular momentum of the Cooper pair, chiral optical absorption is a possible experiment to detect the orbital- dependent superconductivity. The other preprint examines the spectrum of electronic states near a surface or a domain wall in a p-wave superconductor, which may be observable by scanning tunneling microscopy (STM).

Qualitative features of the mean-field BCS-like theory of superconductivity in a strongly disordered system of fermions with short-range order are discussed in a paper by I. F. Herbut (Dalhousie). For the case of infinite-range hopping, the superconducting gap is uniform in space, and there is a smooth BCS-BEC (Bose-Einstein- condensation) crossover with decrease in density at weak disorder; at moderate densities, or larger disorder, the mean-field ground state is the "localized superconductor" of M. Ma and P. A. Lee [Phys. Rev. B 32, 5658 (1985)]. For nearest-neighbor hopping between localized states, the gap becomes highly nonuniform in space but stays everywhere finite at temperatures less than the mean-field transition temperature T_[MF].

A preprint by K. Tanaka and F. Marsiglio (Alberta) tests the canonical BCS wave functions for fixed number of electrons for the attractive Hubbard model. The authors present results in one dimension for various chain lengths, electron densities, and coupling strengths.

Four papers listed in this issue, all with first author A. Aftalion (Ecole Normale Superieure), discuss fundamental mathematical properties of one-dimensional solutions (e.g., dependent only upon the coordinate x) of the time-independent Ginzburg-Landau equations of superconductivity.

Other Activities

Further improvements in the design of a scanning evanescent microwave microscope (SEMM), capable of quantitative measurements of dielectric properties and surface resistance with submicron spatial resolution, are described in a preprint by F. Duewer et al. (LBNL). Using tip-sample feedback control, the authors have been able to achieve simultaneous noncontact imaging of topography and surface resistance with high spatial resolution.

Measurements of the Hall effect in the borocarbides LuNi2B2C and YNi2B2C are reported by V. N. Narozhnyi (IHPP-Troitsk, Dresden, and Wroclaw) et al. for both the normal state and the superconducting mixed state. The behavior of both compounds was found to be quite similar in the mixed state, but the magnetoresistance in the normal state was found to be much larger in LuNi2B2C than in YNi2B2C. The authors attribute the differences in behavior to differences in the topology of the Fermi surfaces of these compounds.

As noted in a preprint by J. A. Wilson (Bristol), the layered chloro- nitride beta-HfNCl, when partially intercalated with organo-solvated Li, shows superconductivity at 26 K. The author discusses the origin of superconductivity in this material and suggests that a scenario similar to that for the Rb3C60 family of intercalated fullerenes might be appropriate.

Ph.D. Thesis

An investigation of nonlinear microwave emission by YBa2Cu3O7-d (YBCO) and Ba0.6K0.4BiO3 (BKBO) is reported in the Ph.D. thesis of A. A. Gallitto (Palermo). The author studied the second- and third-harmonic signals as a function of temperature, applied magnetic field, and input power level, and proposed a phenomenological theory of these effects, which accounts for the results in YBCO near Tc at low applied field. In BKBO, the author suggests that harmonic emission at temperatures far from Tc may be due to nonlinear processes in weak links (74 refs.).

Contributed by John R. Clem

Contents: Technology News begins on page 6; Preprints begin on page 7; Coming Events begin on page 13; Resources begin on page 14; and Donors are listed on page 15.

High-Tc Update is available without charge to interested persons. Recipients are expected to participate in this information exchange by sending us preprints, reprints, meeting news, research news, etc. Contributions to defray the cost of newsletter printing and mailing are welcome.

TECHNOLOGY NEWS (Also see Applications section of Nota Bene.)

This section describes progress in manufacturing, product development, and technology transfer in the high-Tc superconductivity field. Please send your contributions (product development information, news regarding technology transfer efforts, or any information you would like to share about your corporation or laboratory) to the editor.

The Superconductivity Group of Metal Manufactures Ltd. (MM) has been elected to membership of the Australian Technology Showcase (ATS), an international campaign to promote Australian innovation in the spotlight of the 2000 Olympics. The Superconductivity Group works in a strategic partnership with the University of Wollongong which is engaged in HTS research. The MM group has already supplied HTS tape to the southeast Asian region, and has recently marketed HTS products to Europe and North America. The company supplies Bi-2223 tapes with different sheathing materials (Ag, Ag-Au, Ag-Mg, etc.), and filaments n = 1 to 61, carrying currents in excess of 40 A and Jc values > 20,000 A/cm2. Filaments can be twisted for low ac loss, or supplied in the tape-in-tube or wire-in- tube formats. MM also supplies high-current busbars, leads, and cables, and items fabricated from HTS tape such as coils in racetrack, solenoidal, or torroidal formats. MM has a broad and active in-house R&D effort, which is carried out in close collaboration with the University of Wollongong, and is currently working on fundamental mechanisms and processes in high-temperature superconductors, new fabri- cation technologies for Bi-2223 tapes, and has just set up a facility to investigate the manufacture of YBCO/Hasteloy tapes using PLD. The marketing strategy of MM will include the use of its patent base for both commercial protection and for future bargaining. Cross-licensing deals are thought to be the most likely activities in any future HTS strategic alliances with overseas companies. For further infomation, contact Tim Beales, Superconductivity Manager, Metal Manufactures Ltd., Level 33, Gateway, Sydney, NSW 2000, Australia; telephone +61 2 4221 5725; telefax +61 2 4221 5731; e-mail tb1960@msn.com.au.

As announced by Superconductor Technologies Inc. (STI), new SuperFilter(R) SIX-Pak Cellular A-Band and B-Band front-end filter and amplifier systems were recently introduced for the wireless communications industry. The product simultaneously delivers selectivity and sensitivity as a result of the company's proprietary superconducting materials and cryogenic technologies. The SuperFilter(R) SIX-Pak resolves base-station performance tradeoffs and delivers good coverage extension and interference rejection in a practical, low-profile package. The six-in-one design combines all the filters and LNAs (low-noise amplifiers) needed in fully sectored cellular base stations, reducing per-rf path pricing by 40% or more for all base station types. STI's filter and amplifier systems effectively deepen coverage in urban cells and extend coverage in suburban or rural cells. Industry standard rack-mount packaging measures a compact 17" x 25" x 7". At 130 W, the SuperFilter(R) SIX-Pak has very low power requirements and operates on a standard 27 V power supply. Company officials state that the self-contained SuperFilter(R) SIX-Pak is a maintenance-free solution for enhanced base-station performance. For more information, contact Blake Isaacs, Director of Marketing, or Jim Evans, Chief Financial Officer, Superconductor Technologies Inc., 460 Ward Drive, Santa Barbara, CA 93111; telephone (805) 683-7646; telefax (805) 967-0342; e-mail info@suptech.com; Web site http://www.suptech.com.

Contributed by Sreeparna Mitra

PREPRINTS To obtain a particular preprint, contact the first author at the address given at the end of the citation. Help us expand this list by sending us your complete preprint. Please specify where and when your paper was submitted. An * next to an entry indicates it is a correction or revision of a previous entry. PACS codes and/or key words are given at the end of the citation.

A. A. Abrikosov, "Theory of the Negative Isotope Effect on Copper in Underdoped YBCO." Contact Janice Coble, Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telephone (630) 252-5497; telefax (630) 252-9595; e-mail coble@anl.gov. 74.20.Fg; 74.25.Kc; 74.62.Dh; 74.72.Bk.

A. Aftalion and S. J. Chapman, "Asymptotic Analysis of the Bifurcation Diagram for Symmetric One-Dimensional Solutions of the Ginzburg-Landau Equations." Departement de Mathematiques et d'Informatique, Ecole Normale Superieure, 45 rue d'Ulm, F-75230 Paris Cedex 05, FRANCE; telephone +33 44 32-2079 or -3000; telefax +33 44 32-2080; e-mail aftalion@dmi.ens.fr or amandine.aftalion@ens.fr.

A. Aftalion and S. J. Chapman, "Asymptotic Analysis of a Secondary Bifurcation of the One-Dimensional Gunzburg-Landau Equations of Superconductivity." Departement de Mathematiques et d'Informatique, Ecole Normale Superieure, 45 rue d'Ulm, F-75230 Paris Cedex 05, FRANCE; telephone +33 44 32-2079 or -3000; telefax +33 44 32-2080; e-mail aftalion@dmi.ens.fr or amandine.aftalion@ens.fr.

Amandine Aftalion and William C. Troy, "On the Solutions of the One- Dimensional Ginzburg-Landau Equations for Superconductivity." To be published in Physica D. Departement de Mathematiques et d'Informatique, Ecole Normale Superieure, 45 rue d'Ulm, F-75230 Paris Cedex 05, FRANCE; telephone +33 44 32-2079 or -3000; telefax +33 44 32-2080; e-mail aftalion@dmi.ens.fr or amandine.aftalion@ens.fr; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9902261.

Amandine Aftalion and William C. Troy, "Uniqueness of Solutions of the Ginzburg-Landau System for Thin Films." Departement de Mathematiques et d'Informatique, Ecole Normale Superieure, 45 rue d'Ulm, F-75230 Paris Cedex 05, FRANCE; telephone +33 44 32-2079 or -3000; telefax +33 44 32- 2080; e-mail aftalion@dmi.ens.fr or amandine.aftalion@ens.fr.

Yoichi Ando and K. Nakamura, "Vortex Phase Transformations Probed by the Local ac Response of Bi2Sr2CaCu2O8+d Single Crystals with Various Doping." To be published in Phys. Rev. B. Central Research Institute of Electric Power Industry (CRIEPI), 2-11-1 Iwato-kita, Komae, Tokyo 201-8511, JAPAN; e-mail ando@criepi.denken.or.jp; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9903031.

Shunichi Arisawa, Hanping Miao, Hiroki Fujii, Akira Ishii, Stephane Labat, Takeshi Hatano, and Kazumasa Togano, "Preparation and Superconducting Properties of Extremely Thin Bi2Sr2Ca1Cu2Ox Ribbon-Like Films on Silver Substrates." To be published in Physica C. National Research Institute for Metals, 1-2-1 Sengen, Tsukuba-shi, Ibaraki 305 0047, JAPAN; telephone +81 298 59 2320; telefax +81 298 59 2301; e-mail arisawa@nrim.go.jp. Key words: oxide superconductor, Bi2Sr2Ca1Cu2Ox, thin film, ribbon, silver substrate. 74.72.Hs.

A. J. Batista-Leyva, R. Cobas, M.T.D. Orlando, C. Noda, and E. Altshuler, "Magnetic Hysteresis of the Zero-Resistance Critical Temperature in YBaCuO, BiSrCaCuO and HgBaCaCuO Superconducting Polycrystals." To be published in Physica C (in press). Contact E. Altshuler, Superconductivity Laboratory, IMRE-Physics Faculty, University of Havana, 10400 Havana, CUBA; e-mail jea@infomed.sld.cu. Key words: granular superconductivity, electrical resistivity, critical current density, weak links, mixed state, lower critical field H_[c1].

Kamran Behnia, Cigdem Capan, Dominique Mailly, and Bernard Etienne, "Internal Avalanches in a Pile of Superconducting Vortices." Laboratoire de Physique des Solides (CNRS), Universite Paris-Sud, F- 91405 Orsay Cedex, FRANCE; e-mail kamran@lps.u-psud.fr; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9902334.

E. Broide, "Detection and Stimulation of Impulse Electromagnetic Radiation (IEMR) of Radio-Frequency (rf) range (~200 kHz) by Sensitive Element Based on a Resonant Circuit with HTSC Element." Presented at the first Innovations in Materials Conf. (IMc), Washington, DC, July 19- 22, 1998; to be published in Mat. Res. Innovat. Separator Ltd., Building 13A, Kiryat Weizmann, Science Park, Ness-Ziona 70400, ISRAEL; telefax +972 8 940 8085; e-mail broide@inter.net.il. Key words: HTSC powders, impulse radiation, resonance circuit, dielectric composite.

S. Candia and L. Civale, "Angular Dependence of the Magnetization of Isotropic Superconductors: Which is the Vortex Direction?" To be published in Supercond. Sci. & Technol. Comision Nacional de Energia Atomica, Centro Atomico Bariloche and Instituto Balseiro, 8400 Bariloche RN, ARGENTINA.

V. V. Chabanenko, A. A. Prodan, V. A. Shklovskij, A. V. Bondarenko, M. A. Obolenskii, H. Szymczak, and S. Piechota, "Guiding of Vortices in YBa2Cu3O7-d Single Crystals with Unidirected Twins." To be published in Physica C (in press). Contact V. A. Shklovskij, Gvardeitsev Shironintsev 38, Apt. 6, Box 572, 310123 Kharkiv, UKRAINE; telephone +380 572 663 613; telefax +380 572 351 738; e-mail valerij.a.shklovskij@univer.kharkov.ua or shklovskijva@hotmail.com. Key words: YBaCuO single crystal, unidirected twins, anisotropic pinning, even transverse magnetoresistance.

*A. Cowie, L. F. Cohen, and M. W. Denhoff, "The Microwave Power Handling of a FIB Generated Weak Link in a YBCO Film." Report NRC #42223; submitted to Supercond. Sci. & Technol. Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2BZ, UNITED KINGDOM; M. W. Denhoff's e-mail at National Research Council, Canada denhoff@nrcphy1.phy.nrc.ca; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9902095. *New cond-mat number.

A. L. Crossley, Y. H. Li, A. D. Caplin, and J. L. MacManus-Driscoll, "The Effect of Low Oxygen Partial Pressure and High Pb-Doping on Bi-2212 Phase Formation and Flux Pinning." To be published in Physica C (in press). Contact J. L. MacManus-Driscoll, Department of Materials, Centre for High Temperature Superconductivity, Imperial College of Science, Technology and Medicine, Prince Consort Road, London SW7 2BP, UNITED KINGDOM; telephone +44 171 594 6749; telefax +44 171 584 3194; e- mail j.driscoll@ic.ac.uk. Key words: superconductivity, Pb doping, Bi- 2212, pinning, low pO2 processing, nanophases. 74.62.Dh; 74.72.Hs.

R. J. Drost, C. J. van der Beek, H. W. Zandbergen, M. Konczykowski, A. A. Menovsky, and P. H. Kes, "Tuning the Pinning Energy in Layered Superconductors." To be published in Phys. Rev. B. Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9506, 2300 RA Leiden, THE NETHERLANDS. 74.60.Ec; 74.60.Ge; 74.60.Jg.

Fred Duewer, C. Gao, I. Takeuchi, and X.-D. Xiang, Tip-Sample Distance Feedback Control in a Scanning Evanescent Microwave Microscope." To be published in Appl. Phys. Lett. Contact X.-D. Xiang, Materials Science Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720; e-mail xdxiang@lbl.gov.

M. Farbod, S. Giblin, M. Bennett, and J. A. Wilson, "To What Degree is Hg-1201 Able to Act as Archetype of the HTSC Cuprate Phenomenon?" Submitted to Phys. Rev. B. Contact J. A. Wilson, H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UNITED KINGDOM; telephone +44 171 928 8710; telefax +44 171 925 5624. Key words: Hg-1201, Seebeck behavior, stripe phase, one-eighth anomaly. 74.72.Gr; 74.25.Fy; 74.20.Mn; 74.62.Bf.

Aurelio Agliolo Gallitto, "Nonlinear Microwave Response of High-Tc Superconductors." Submitted as a Ph.D. thesis (Universita Degli Studi). Dipartimento di Scienze Fisiche e Astronomiche, Universita Degli Studi, Via Archirafi 36, I-90123 Palermo, ITALY; telephone +39 091 623 4207; telefax +39 091 616 2461; e-mail agliolo@fisica.unipa.it; Web site http://www.fisica.unipa.it/~agliolo. (Thesis in Italian.)

M. Ghinovker, I. Shapiro, and B. Ya. Shapiro, "Creation of Long Living Vortex-Antivortex Matter by Laser Pulse." To be published in J. Low Temp. Phys. Contact B. Ya. Shapiro, Institute of Superconductivity, Department of Physics, Bar-Ilan University, Ramat Gan 52900, ISRAEL. 74.20.De; 74.60.Ge.

Sanjay Gupta, R. Suba, B. D. Padalia, Om Prakash, I. K. Gopalakrishnan, and J. V. Yakhmi, "Manifestation of T' and 1-2-3 Features in [Nd2/3(Ce1- xThx)1/3]2(Ba2/3Nd1/3)2Cu3O9-d Compounds: A XANES Study." To be published in Physica C (in press). Contact B. D. Padalia, Department of Physics, Indian Institute of Technology, Powai, Mumbai 400 076, INDIA; telephone +91 22 578 2545; telefax +91 22 578 3480; e-mail phbdpia@niharika.phy.iitb.ernet.in. Key words: 2-2-3 system, x-ray absorption near edge structure, T'-type compounds.

Qiang Han and Liyuan Zhang, "Vortex Lattice Structure in a d-Wave Superconductor with Orthorhombic Distortion." To be published in Phys. Rev. B. Contact Liyuan Zhang, Department of Physics, Peking University, Beijing 100871, PEOPLE'S REPUBLIC OF CHINA. 74.20.De; 74.60.-w.

Igor F. Herbut, "Remarks on the Mean-Field Theory of Strongly Disordered Superconductors." Department of Physics, Dalhousie University, Halifax, Nova Scotia, CANADA B3H 3J5; e-mail herbut@herbut.phys.dal.ca; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9902305.

Andrew D. Hibbs and Brian R. Whitecotton, "Signal Amplification and Signal to Noise Ratio Improvements in Thermally Switching SQUIDS." To be published in Appl. Supercond. (in press). Quantum Magnetics Inc., 7740 Kenamar Court, San Diego, CA 92121; telephone (619) 566-9200; telefax (619) 566-9388; e-mail andy@qm.com.

A. Hu, P. Schaetzle, W. Bieger, P. Verges, G. Fuchs, and G. Krabbes, "Melt Processing and High Performance of Binary (Nd,Sm)-Ba-Cu-O Superconductors." To be published in Supercond. Sci. & Technol. Institut fuer Festkoerper- und Werkstofforschung Dresden, P.O. Box 270016, D-01171 Dresden, GERMANY; e-mail a.hu@ifw-dresden.de.

*C. R. Hu and X. Z. Yan, "Predicted Giant Magnetic Moment on Non-{nOm} Surfaces of d-Wave Superconductors: Can It Be Observed and How?" Preprint #99:004; submitted to Phys. Rev. Lett. Department of Physics, Texas A&M University, College Station, TX 77843-4242; preprint also available from Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5932; telephone (713) 743-8200; telefax (713) 743-8201; e-mail preprints@www.tcs.uh.edu; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9901334. *New cond-mat number.

U. Jaenicke-Roessler, A. Belger, G. Zahn, B. Wehner, P. Paufler, and H. Bitterlich, "Structural Studies with TbNi2B2C Single Crystals and TbxY(1-x)Ni2B2C Polycrystals." To be published in Physica C (in press). Contact P. Paufler, Institut fuer Kristallographie und Festkoerperphysik, Fachrichtung Physik der Technischen Universitaet, D- 01062 Dresden, GERMANY; telephone +49 351 463 4670; telefax +49 351 463 7048; e-mail paufler@physik.tu-dresden.de. Key words: intermetallic borocarbides, structure refinement, lattice parameters, thermal expansion. 61.12.Ld; 62.20.Dc.

D. Y. Jeong, H. K. Kim, and Y. C. Kim, "Much Enhanced Jc by Intermediate Rolling in Just-Rolled Tl-1223/Ag Tapes." To be published in Physica C (in press). Korea Electrotechnology Research Institute, Changwon 641- 120, SOUTH KOREA; telephone +82 551 80 1608; telefax +82 551 80 1696; e- mail dyjeong@keri.re.kr. Key words: Tl-1223/Ag tapes, high Jc, directional grain-alignment, powder-in-tube method.

Robin J. Kennedy, William P. Tucker, and Patricia A. Stampe, "Growth of YBa2Cu3O7 on Silicon and LaAlO3 with MgO Buffer Layers." To be published in Physica C (in press). Contact Patricia A. Stampe, Room B329, National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, FL 32310; telephone (850) 599- 8373 or -8374; telefax (850) 599-8376 or -8370; e-mail stampe@cennas.nhmfl.gov. Key words: YBa2Cu3O7-x, superconductivity, laser ablation, epitaxial, silicon. 81.15.Fg; 74.76.Bz; 61.10.-i.

D. H. Kim, K. E. Gray, N. Jukam, D. J. Miller, Y. H. Kim, J. M. Lee, J. H. Park, and T. S. Hahn, "Vortex-Motion Noise in YBa2Cu3Ox Films Before and After Heavy-Ion Irradiation." Submitted to Phys. Rev. B. Contact Janice Coble, Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telephone (630) 252-5497; telefax (630) 252-9595; e-mail coble@anl.gov. 74.40.+k; 74.60.Ge.

T. Kitajima, T. Takayanagi, T. Takemura, and I. Terasaki, "Anisotropic Resistivity of an Antiferromagnetic Insulator Bi2Sr2ErCu2O8." To be published in J. Phys. Cond. Mat. Contact I. Terasaki, Department of Applied Physics, Waseda University, 3-4-1, Ohkubo, Shinjuku-ku, Tokyo 169-8555, JAPAN; telephone +81 3 5286 3854; telefax +81 3 5286 3854; e- mail terra@mn.waseda.ac.jp; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9903023.

V. M. Krasnov, "Single Fluxon in Double Stacked Josephson Junctions: Analytic Solution." Department of Microelectronics and Nanoscience, Chalmers University of Technology, S-41296 Goeteborg, SWEDEN; telephone +46 31 772 3397; telefax +46 31 772 3471; e-mail krasnov@fy.chalmers.se; Web site http://fy.chalmers.se/~krasnov/; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9812272.

V. M. Krasnov and D. Winkler, "The Shape of a Moving Fluxon in Stacked Josephson Junctions." Department of Microelectronics and Nanoscience, Chalmers University of Technology, S-41296 Goeteborg, SWEDEN; telephone +46 31 772 3397; telefax +46 31 772 3471; e-mail krasnov@fy.chalmers.se; Web site http://fy.chalmers.se/~krasnov/; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9903024.

J. Krelaus, M. Reder, J. Hoffmann, and H. C. Freyhardt, "Magnetization and Relaxation in Hg-1223: Bulk vs. Surface Irreversibility, Anisotropy and the Influence of Re-Doping." To be published in Physica C (in press). Kernforschungszentrum Karlsruhe, Institut fuer Technische Physik, Postfach 3640, D-76021 Karlsruhe, GERMANY; telephone +49 7247 82 2941; telefax +49 7247 82 5398; e-mail krelaus@itp.fzk.de. Key words: Hg-1223, Re-doping, surface barrier, relaxation, anisotropy.

Dung-Hai Lee, "Pairing via Index Theorem." Department of Physics, University of California at Berkeley, Berkeley, CA 94720; e-mail dunghai@socrates.berkeley.edu; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9902287. 74.25.Jb; 79.60.-i; 71.27.+a.

Yang Li, Lijie Cui, Guohui Cao, Qingzhu Ma, Chunguang Tang, Yunbo Wang, Long Wei, Y. Z. Zhang, Z. X. Zhao, and Elisa Baggio-Saitovitch, "Positron Annihilation Study on the Stress-Field Pinning Mechanism in (Eu,Y)-123 Superconductors." To be published in Physica C (in press). Centro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro, RJ, BRAZIL; telefax +55 21 295 5743; e-mail yli@cbpfsu1.cat.cbpf.br. Key words: positron annihilation, stress- field pinning, Eu-doped Y-123 superconductor. 74.60.Ge; 74.60.Jg; 61.80.Fe.

M. Majoros, B. A. Glowacki, A. M. Campbell, Z. Han, and P. Vase, "Apparent ac Losses in Helical BiPbSrCaCuO-2223/Ag Multifilamentary Tape Measured by Different Potential Taps at Power Frequencies." To be published in Physica C (in press). Interdisciplinary Research Centre in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UNITED KINGDOM; telephone +44 1223 337441; telefax +44 1223 337074; e-mail mm293@cus.cam.ac.uk. Key words: ac losses, multifilamentary BiPbSrCaCuO tapes, lock-in technique.

S. Manninen, K. Haemaelaeinen, M.A.G. Dixon, M. J. Cooper, D. A. Cardwell, and T. Buslaps, "Electronic Properties of YBa2Cu3O7-d and Bi2Sr2CaCu2O8 Superconductors Studied by Compton Scattering Technique." To be published in Physica C (in press). Department of Physics, University of Helsinki, P.O. Box 9, FIN-00014 Helsinki, FINLAND; telephone +358 9 191 8324; telefax +358 9 191 8680; e-mail seppo.manninen@helsinki.fi. Key words: superconductors, YBa2Cu3O7-d, Bi2Sr2CaCu2O8, Compton scattering.

Masashige Matsumoto and Manfred Sigrist, "Chiral Optical Absorption by a Vortex in p_x+-ip_y-Wave Superconductor." To be published in J. Phys. Soc. Jpn. Department of Physics, Faculty of Science, Shizuoka University, 836 Oya, Shizuoka 422-8529, JAPAN; e-mail spmmatu@sppc24.sci.shizuoka.ac.jp; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9903004. Key words: Sr2RuO4, orbital dependent superconductivity, p_x+-ip_y-wave superconductor, vortex, chiral optical absorption, dichroism, domain.

Masashige Matsumoto and Manfred Sigrist, "Quasiparticle States Near the Surface and the Domain Wall in a p_x+-ip_y-Wave Superconductor." To be published in J. Phys. Soc. Jpn. Department of Physics, Faculty of Science, Shizuoka University, 836 Oya, Shizuoka 422-8529, JAPAN; e-mail spmmatu@sppc24.sci.shizuoka.ac.jp; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9902265. Key words: Sr2RuO4, p-wave superconductor, unitary state, time-reversal breaking state, boundary effect, surface, domain wall, quasi-classical theory, Ginzburg-Landau free energy.

A. Mourachkine, "The Effect of Ni and Zn Doping in Bi-2212 from Tunneling Measurements: The MCS Model of the High-Tc Superconductor in Hole-Doped Cuprates." Service de Physique des Solides, Universite Libre de Bruxelles, CP233, Boulevard du Triomphe, B-1050 Brussels, BELGIUM; telephone +32 2 650 5751; telefax +32 2 650 5916; e-mail anmourac@ulb.ac.be; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9902355.

Shuichi Murakami, Naoto Nagaosa, and Manfred Sigrist, "An SO(5) Model of p-Wave Superconductivity and Ferromagnetism." Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, JAPAN; e-mail murakami@appi.t.u-tokyo.ac.jp; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9811001. 74.20.De; 74.70.-b; 75.25.+z; 71.27.+a.

V. N. Narozhnyi, J. Freudenberger, V. N. Kochetkov, K. A. Nenkov, G. Fuchs, A. Handstein, and K.-H. Mueller, "Hall-Effect in LuNi2B2C and YNi2B2C Borocarbides: A Comparative Study." Submitted to Phys. Rev. B. Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow Region 142092, RUSSIA; e-mail narozh@ns.hppi.troitsk.ru; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9902299. 74.72.Ny; 72.15.Gd; 74.60.Ec.

Y. Naveh and D. V. Averin, "Non-Equilibrium Current Noise in Mesoscopic Disordered SNS Junctions." Submitted to Phys. Rev. Lett. Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, NY 11794-3800; telephone (516) 632-7698; telefax (516) 632- 8774; e-mail yehuda@hana.physics.sunysb.edu or ynaveh@ccmail.sunysb.edu; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9902202.

M. Nohara, M. Isshiki, F. Sakai, and H. Takagi, "Quasiparticle Density of States of Clean and Dirty s-Wave Superconductors in the Vortex State." To be published in J. Phys. Soc. Jpn. Institute for Solid State Physics, University of Tokyo, 7-22-1, Roppongi, Minato-ku, Tokyo 106-8666, JAPAN; telephone +81 3 3478 6811, ext. 5663; telefax +81 3 3478 7698; e-mail nohara@troy.issp.u-tokyo.ac.jp; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9902264. 74.25.Bt; 74.60.Ec; 74.70.Ad.

I. M. Obaidat, H. Safar, and J. S. Kouvel, "Vortex-Antivortex Behavior in a Tilted YBa2Cu3O7-d Crystal." To be published in Physica C. Department of Physics, University of Illinois at Chicago, 845 W. Taylor Street, Chicago, IL 60607-7059.

J. L. O'Brien, H. Nakagawa, A. S. Dzurak, R. G. Clark, B. E. Kane, N. E. Lumpkin, N. Miura, E. E. Mitchell, J. D. Goettee, J. S. Brooks, D. G. Rickel, and R. P. Starrett, "Experimental Determination of B-T Phase Diagram of YBa2Cu3O7-d to 150 T for B perp. to c." National Pulsed Magnet Laboratory and Semiconductor Nanofabrication Facility, School of Physics, University of New South Wales, Sydney 2052, AUSTRALIA; telephone +61 2 9385 5377; telefax +61 2 9385 6060; e-mail job@phys.unsw.edu.au; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9901341. 74.25.Dw; 74.76.Bz; 74.25.Fy; 74.60.Ec; 74.72.Bk.

C. Panagopoulos, B. D. Rainford, J. R. Cooper, W. Lo, J. L. Tallon, J. W. Loram, J. Betouras, Y. S. Wang, and C. W. Chu, "Effects of Carrier Concentration on the Superfluid Density of High-Tc Cuprates." Submitted to Phys. Rev. Lett. Interdisciplinary Research Centre in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UNITED KINGDOM; telephone +44 1223 337-072 or -076; telefax +44 1223 337-074; e-mail cp200@hermes.cam.ac.uk; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9903117. 74.25.Nf; 74.62.Dh; 74.72.Dn; 74.72.Gr.

Joo Hyung Park and Sang Yeol Lee, "Orientation Transition in a Thick Laser Deposited YBa2Cu3O7-x Film Observed by Glancing Angle X-Ray Diffraction." To be published in Physica C (in press). Department of Electrical Engineering, Yonsei University, Seoul 120-749, SOUTH KOREA; telephone +82 2 361 2776; telefax +82 2 364 9770; e-mail zhpark@bubble.yonsei.ac.kr. Key words: pulsed laser deposition (PLD), YBa2Cu3O7-x (YBCO), glancing angle x-ray diffraction, orientation.

G. Pasquini, L. Civale, H. Lanza, and G. Nieva, "Dynamic Regimes in the ac Response of YBa2Cu3O7 with Columnar Defects: Intra- and Inter-Valley Vortex Motion." To be published in Phys. Rev. B. Departamento de Fisica, Comision Nacional de Energia Atomica (CNEA), Av. del Libertador 8250, 1429 Buenos Aires, ARGENTINA. 74.60.Ge; 74.60.Jg; 74.72.Bk.

M. I. Petrov, D. A. Balaev, D. M. Gohfeld, S. V. Ospishchev, K. A. Shaihudtinov, and K. S. Aleksandrov, "Applicability of the Theory Based on Andreev Reflection to the Description of Experimental Current-Voltage Characteristics of Polycrystalline HTSC + Normal Metal Composites." To be published in Physica C (in press). L. V. Kirensky Institute of Physics, Krasnoyarsk 660036, RUSSIA; telefax +7 3912 438923; e-mail smp@iph.krasnoyarsk.su. Key words: YBaCuO + BaPbO3 composites, network of weak S-N-S links, current-voltage characteristic. 74.50.+r.

A. K. Pradhan, S. Shibata, T. Machi, K. Nakao, and N. Koshizuka, "Crossover from the Vortex-Lattice Melting to the Continuous Transition in Twinned NdBa2Cu3Oy Single Crystals." To be published in Physica C. Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 10-13 Shinonome 1-chome, Koto-ku, Tokyo 135- 0062, JAPAN; telefax +81 3 3536-5714 or -5717; e-mail pradhan@istec.or.jp. Key words: melting transition, flux pinning, substitution.

M. V. Sadovskii, "Optical Conductivity in a Simple Model of Pseudogap State in Two-Dimensional System." Report #IEF-LTF 99-01. Institute for Electrophysics, Russian Academy of Sciences, Ural Branch, 620049 Ekaterinburg, RUSSIA; e-mail sadovski@ief.uran.ru; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9902192.

Sergei Sergeenkov and Marcel Ausloos, "Phase Dependent Differential Thermopower of SND Junctions: Pair-Breaking Effects and Gaussian Fluctuations. To be published in Phys. Rev. B. SUPRAS, Institute of Physics, University of Liege, B-4000 Liege, BELGIUM; e-mail serge@gw.unipc.ulg.ac.be; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9902259. 74.25.Fy; 74.80.Fp.

Weidong Si, Hong-Cheng Li, and X. X. Xi, "Strain and Oxygenation Effects on Superconductivity of La1.85Sr0.15CuO4 Thin Films." Department of Physics, Pennsylvania State University, University Park, PA 16802; X. X. Xi's e-mail xi@phys.psu.edu.

A. Silhanek, L. Civale, S. Candia, G. Nieva, G. Pasquini, and H. Lanza, "Evidence for Vortex Staircases in the Whole Angular Range Due to Competing Correlated Pinning Mechanisms." To be published in Phys. Rev. B. Comision Nacional de Energia Atomica, Centro Atomico Bariloche and Instituto Balseiro, 8400 Bariloche RN, ARGENTINA; e-mail silhanek@cabbat1.cnea.gov.ar; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9902302.

F. Tafuri, F. Miletto Granozio, F. Carillo, A. Di Chiara, K. Verbist, and G. Van Tendeloo, "Microstructure and Josephson Phenomenology in 45- degree Tilt and Twist YBa2Cu3O7-d Artificial Grain Boundaries." To be published in Phys. Rev. B. INFM-Dipartimento di Scienze Fisiche, Universita di Napoli "Federico II," Piazzale Tecchio 80, I-80125 Napoli, ITALY; F. Miletto Granozio's telephone +39 081 768 2423; telefax +39 081 239 1821; e-mail miletto@na.infn.it. 74.50.+r; 74.72.Bk; 74.76.Bz; 74.80.Fp.

K. Tanaka and F. Marsiglio, "Canonical BCS Approximation for the Attractive Hubbard Model." Preprint #Alberta Thy 03-99; submitted to the Proc. of the University of Miami Conf. on High Temp. Supercond. (HTS99), Miami, Fla., Jan. 7-13, 1999. Department of Physics, University of Alberta, Edmonton, Alberta, CANADA T6G 2J1; e-mail ktanaka@phys.ualberta.ca; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9902285.

Yukio Tanaka, Takashi Hirai, Koichi Kusakabe, and Satoshi Kashiwaya, "Theory of the Josephson Effect in Superconductor/One-Dimensional Electron Gas/Superconductor Junction." Submitted to Phys. Rev. B. Department of Applied Physics, Nagoya University, Nagoya 464 8603, JAPAN; Koichi Kusakabe's telefax at Niigata University +81 25 263 3961; e-mail kabe@bussei.sc.niigata-u.ac.jp; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9902351.

Y. Tanaka and S. Kashiwaya, "Theory of the Josephson Effect in Superconductor/Ferromagnet/Superconductor Junctions." Submitted to Phys. Rev. B. Department of Applied Physics, Nagoya University, Nagoya 464 8603, JAPAN; S. Kashiwaya's telephone at Electrotechnical Laboatory, Ibaraki, Japan +81 298 54 5568; telefax +81 298 54 5569; e-mail kasiwaya@etl.go.jp; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9903034.

A. M. Troyanovskii, J. Aarts, and P. H. Kes, "Collective and Plastic Vortex Motion Probed By STM." Submitted to Nature. Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, THE NETHERLANDS.

M. Valldor, I. Bryntse, and A. Morawski, "Synthesis and X-Ray Single- Crystal Analysis of a 2212-Type Superconductor in the Tl-Hg-Sr-Ca-Cu-O System." To be published in Physica C (in press). Contact I. Bryntse, Department of Inorganic Chemistry, Arrhenius Laboratory, Stockholm University, S-10691 Stockholm, SWEDEN; telephone +46 8 162434; telefax +46 8 152187; e-mail ingridb@inorg.su.se. Key words: synthesis, x-ray, energy dispersive spectrometry.

S. Wakimoto, R. J. Birgeneau, Y. Endoh, P. M. Gehring, K. Hirota, M. A. Kastner, S. H. Lee, Y. S. Lee, G. Shirane, S. Ueki, and K. Yamada, "Observation of New Incommensurate Magnetic Correlations at the Lower Critical Concentration for Superconductivity (x=0.05) in La2-xSrxCuO4." Department of Physics, Brookhaven National Laboratory, Upton, NY 11973; Y. S. Lee's e-mail at MIT younglee@yoko.mit.edu; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9902201. 74.72.Dn; 75.10.Jm; 75.50.Ee.

Z. H. Wang, S. J. Wang, J. L. Chen, H. Zhang, and X. W. Cao, "Two- Dimensional Behavior in (YBa2Cu3O7-d)24/(PrBa2Cu3O7-d)2 Multilayer Thin Films." To be published in Physica C. Shanghai Institute of Metallurgy, Chinese Academy of Sciences, Shanghai 200050, PEOPLE'S REPUBLIC OF CHINA; telephone +86 21 6251 1070, ext. 8924; telefax +86 21 6251 3510; e-mail zhwang@itsvr.sim.ac.cn.

John A. Wilson, "Reinterpretation of Femtosecond Laser Pump-Probe and Thermomodulation Optical Spectroscopy Results on HTSC Materials in Terms of Resonant Negative-U Model." Submitted to Phys. Rev. B. H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UNITED KINGDOM; telephone +44 171 928 8710; telefax +44 171 925 5624. Key words: HTSC negative-U mechanism, laser pump/probe and thermomodulation optical spectroscopies.

John A. Wilson, "The Superconductivity of Li-Intercalated beta-HfNCI in the Light of the HTSC Cuprates." Submitted to J. Phys.: Cond. Mat. H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UNITED KINGDOM; telephone +44 171 928 8710; telefax +44 171 925 5624.

J. A. Wilson and M. Farbod, "A View of Pseudogap Formation and the HTSC Mechanism from the Perspective of Seebeck Results on HgBa2CuO4+d." Submitted to Physica C. H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UNITED KINGDOM; telephone +44 171 928 8710; telefax +44 171 925 5624. Key words: Hg-1201, Seebeck data, pseudogap, negative-U HTSC. 74.72.Gr; 74.25.Fy; 74.20.Mn; 74.62.Bf.

J. Wosik, L. M. Xie, J. Mazierska, and R. Grabovickic, "Influence of Columnar Defects on Surface Resistance of YBa2Cu3Ox Superconducting Thin Films: Nonlinear Effects." Preprint #99:007; submitted to Appl. Phys. Lett. Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5932; telephone (713) 743-8200; telefax (713) 743- 8201; e-mail preprints@www.tcs.uh.edu.

Ahmad Kamal Yahya and R. Abd-Shukor, "Ultrasonic Velocity Measurements on Superconducting and Non-Superconducting TlSr2(Ca1-xPrx)Cu2O7-d." To be published in Physica C (in press). Contact R. Abd-Shukor, Department of Physics, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor Darul Ehsan, MALAYSIA; telephone +60 3 8292904; telefax +60 3 8292880; e-mail ras@pkrisc.ukm.my. Key words: ultrasound velocity, Debye temperature, oxygen ordering. 74.25.Ld; 62.20.Dc.

Xin-Zhong Yan and Chia-Ren Hu, "Magnetic Field Effect in Josephson Tunneling Between d-Wave Superconductors." Submitted to Phys. Rev. Lett. Department of Physics, Texas A&M University, College Station, TX 77843-4242; Chia-Ren Hu's e-mail hu@rainbow.physics.tamu.edu; preprint also available at http://xxx.lanl.gov/abs/cond-mat/9902359.

COMING EVENTS (An * indicates a previously listed event. Also see complete listing of upcoming conferences and workshops at our Web site http://www.iitap.iastate.edu/htcu/comevents.html.)

April 25 - 28, 1999: Fifth Twente Workshop -- Digital Applications, Josephson Junctions and Sensors, Low Temperature Division, University of Twente, The Netherlands. Aim of this meeting is an international exchange of latest results on the electronic applications of superconductors. Workshop will have an extended review on the subjects to show what the expectations are, and what can be realized. Subjects for this years workshop are: digital applications, RSFQ-logic, sensors, film growth, Josephson junctions, and interconnects. Morning sessions devoted to invited talks with discussion breaks; afternoon sessions to include contributed papers and daily poster sessions. Number of participants is limited to 50. For information, contact Ir. H.J.H. Smilde, University of Twente, Department of Applied Physics (TN/LT), P.O. Box 217, 7500 AE Enschede, The Netherlands; telephone +31 53 489 3841; telefax +31 53 489 1099; e-mail h.j.h.smilde@tn.utwente.nl; Web site http://www.esas.org/workshops/twente5.

July 12 - 23, 1999: XI Workshop on Strongly Correlated Electron Systems, International Centre for Theoretical Physics, Trieste, Italy. Will contain a special focus on open problems and perspectives in strong correlation physics. The workshop will include both experimentalists and theorists, and will foster the interaction between them. Topics of special attention include: quantum phase transitions, realizations of correlated electron physics in mesoscopic devices, experimentally motivated aspects of cuprate physics, giant magnetoresistance and novel phenomena in transition metal oxides, complex heavy fermions, and quantum glasses. Scientists and students from all countries that are members of the UN, UNESCO or IAEA can attend the Workshop. Funds to cover local expenses for a very limited number of participants available. Workshop will be conducted in English. Application deadline, April 30, 1999. Contact XI Workshop on Strongly Correlated Electron Systems, The Abdus Salam International Centre for Theoretical Physics, P.O. Box 586, I-34100 Trieste, Italy; telephone +39 40 2240111; telefax +39 40 224163; e-mail smr1144@ictp.trieste.it.

July 19 - 24, 1999: International Summer School, Advanced Methods in Surfaces and Interfaces. Objective of the school is to present and discuss the most recent advances in surface and interface science. Speakers will present pedagogical lectures on advanced experimental and theoretical studies of superconductors, semiconductors, metals and biomaterials. Topics will include (among others): optical methods, spectromicroscopy, synchrotron radiation related techniques, electron microscopy, electron holography, x-ray diffraction, scanning tunneling microscopy and spectroscopy (STM, STS), photoreaction and photostimulated desorption, helium atom beam scattering, dichroism, absorption spectroscopy, STM image simulation, new generation synchrotron sources. Limited to 80 participants/students. Preregistration deadline, May 31, 1999. For more information, contact Claude Zwicky, IPA-EPFL, CH-1015 Lausanne, Switzerland; telefax +41 21 693 4666; e-mail zwicky@ipasg.epfl.ch; Web site http://dpwww.epfl.ch/surfaces99/.

*Aug. 4 - 11, 1999: 22nd International Conference on Low Temperature Physics (LT22), Helsinki University of Technology (HUT), Otaniemi, Espoo and Helsinki, Finland. Topics will include: quantum gases, fluids, and solids; superconductivity; magnetism and lattice properties; quantum electron transport; applications; materials; and techniques. LT22 will have limited funds to assist graduate students, junior faculty, as well as participants from institutions and countries where support is difficult to obtain. Preregistration and abstract deadline, April 15, 1999. Proceedings will appear as a special issue of Physica B -- Cond. Mat., in April 2000. For information, contact Conference Service Bureau, TSG-Congress Ltd., Kaisaniemenkatu 3 B 31, FIN-00100 Helsinki, Finland; telephone +358 9 628044; telefax +358 9 667675; e-mail info@tsgcongress.fi. For technical information, contact the LT22 Office, Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 2200, FIN-02015 HUT, Finland; telephone +358 9 451 2962; telefax +358 9 451 2969; e-mail info@LT22.hut.fi; Web site http://lt22.hut.fi/LT22/LT22.html.

Aug. 27 - 29, 1999: Workshop on Superlattice and Microstructures, Cancun, Mexico. Tentative topics are: a) Preparation and Characterization -- growth, scanning probe microscopy, microscopy, surface techniques, x-rays, lithography; b) Superconductivity -- tunneling; superlattices, Josephson junctions, small structures, thin films, vortices; c) Magnetism -- exchange bias, transport, tunneling, collective modes, magnetotransport; d) Semiconductors -- quantum hall effect, optical properties of superlattices, surfaces; e) Unusual Systems -- amorphous, microstructures, oxides, complex materials, transport through one atom. For information, contact one of the organizers: Ciro Falcony, Departamento de Fisica, Centro de Investigacion y de Estudios Avanzados del, IPN, P.O. Box 14-740, Mexico, 07000 D.F., Mexico; telephone +525 747 3800, ext. 6168 or 6159; telefax +525 747 7097; e-mail cfalcony@fis.cinvestav.mx or Ivan K. Schuller, Department of Physics, University of California, San Diego, La Jolla, CA 92093-0319; e-mail ischuller@ucsd.edu. Information also available at http://web.telesat.com.co/~tablaz/cancun99/index.html.

*Sept. 14 - 17, 1999: Fourth European Conference on Applied Superconductivity (EUCAS'99), Melia Gran Sitges, Hotel in Sitges, Barcelona, Catalonia, Spain. Aim is to provide a forum for presentation and discussion of the developments in the field of the applications of superconductivity, in both large and small scale, including the most recent advances in the subject. All aspects of applied superconductivity will be covered, from both a scientific point of view (contributions from the fields of physics, electronics, material properties, chemistry, and engineering), and also an industrial perspective. Conference will encourage new cooperation on European and wider international levels. The program will be divided into two main sections. Large Scale & Power Applications will include fusion and SMES, detectors and accelerators, fault current limiters, motors and generators, high magnetic fields, wires and cables, materials related to large-scale applications, system aspects, and other applications. Small Scale & Electronic Applications will include Josephson junctions, SQUIDs, digital applications, mixers/detectors, passive devices, oscillators and volt standards, materials related to superconducting electronics, system aspects, and other applications. For further information, contact Xavier Obradors, Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, E-08193 Bellaterra (Barcelona), Catalonia, Spain; telephone +34 93 580 18 53; telefax +34 93 580 57 29; e-mail eucas99@icmab.es; Web site http://www.icmab.es/eucas99.

Nov. 15 - 18, 1999: 44th Annual Conference on Magnetism and Magnetic Materials, Fairmont Hotel, San Jose, Calif. The Conference annually brings together scientists and engineers interested in recent developments in all branches of fundamental and applied magnetism. Emphasis is placed on experimental and theoretical research in magnetism, the properties and synthesis of new magnetic materials, and advances in magnetic technology. Invited and contributed papers. Topics are: fundamental properties, cooperative phenomena and strongly correlated systems, transport properties, computational magnetics and imaging, soft magnetic materials and applications, hard magnetic materials and applications, structured materials, other magnetic materials, magnetic recording, applications, and interdisciplinary topics. Abstract deadline, May 15, 1999. Proceedings will be published in J. Appl. Phys. For information, contact Diane Suiters, Conference Coordinator, Courtesy Associates, 2000 L Street, NW Suite 710, Washington, DC 20036; telephone (202) 973-8668; telefax (202) 973-8722; e-mail magnetism@courtesyassoc.com; Web site http://www.magnetism.org/.

RESOURCES

Information

Proceedings: Symmetry and Pairing in Superconductors -- Proceedings of the NATO Advanced Research Workshop, Yalta, Ukraine, April 29-May 2, 1998, edited by Marcel Ausloos and Sergei Kruchinin. Contains latest findings of leading researchers on high-Tc superconductivity, including considerations of the order parameter and the pairing conditions. Both theoretical and advanced experimental results are outlined. Considerations of d-, s-, or more complicated order-parameter symmetry are discussed at length, serving as a benchmark for an overall view of the field. Details of experiments on junctions and fluctuations, both in the presence and absence of a magnetic field are presented. Electronic, optical, magnetic, and transport properties are discussed. Publ. 1999; 424 pp.; price $192 (hardbound) or $84 (PB); ISBN 0-7923- 5520-2 (HB) or 0-7923-5521-0 (PB). Contact Kluwer Academic Publishers, Customer Service Department, P.O. Box 358, Accord Station, Hingham, MA 02018-0358; telephone (781) 871-6600; telefax (781) 871-9045; e-mail kluwer@wkap.com. Outside the Americas, contact Kluwer Academic Publishers, Customer Service Department, P.O. Box 989, 3300 AZ Dordrecht, The Netherlands; telephone +31 78 639 23 92; telefax +31 78 639 22 54; e-mail services@wkap.nl.

New Book: Electromagnetic Absorption in the Copper Oxide Superconductors, by Frank J. Owens and Charles P. Poole, Jr. This volume presents an overview of the field with an emphasis on the new superconducting materials. Elementary introduction to superconductivity, properties most essential to understanding electromagnetic absorption of the superconducting state, outline of both basic theories and salient experimental results are presented. Contents are: the superconducting state, new superconductors, experimental methods and complementary techniques, electromagnetic absorption in the normal state, zero-magnetic-field microwave absorption, low-magnetic- field-induced microwave absorption, electromagnetic absorption due to vortex motion, infrared and optical absorption, applications, and index. Publ. 1999; 212 pp.; price $82.50; ISBN 0-306-45948-5. Contact Kluwer Academic Publishers, Order Department, P.O. Box 358, Accord Station, Hingham, MA 02018-0358; telephone (781) 871-6600; telefax (781) 871-6528; e-mail kluwer@wkap.com. Outside the U.S., contact Kluwer Academic/Plenum Publishers, Book Department, P.O. Box 322, 3300 AH Dordrecht, The Netherlands; telephone +31 78 639 23 92; telefax +31 78 654 64 74; e-mail services@wkap.nl.

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High-Tc Update is the high-Tc superconductivity information exchange newsletter. Please send 1) preprints, reprints, and other research reports; 2) descriptions of on-going work; 3) meeting announcements and summaries.

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Project Director/Editor: Sreeparna Mitra Science Editor: John R. Clem High-Tc Update, Vol. 13, #7, April 1, 1999.