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Vortices
According to a preprint by V. V. Moshchalkov et al. (Leuven), the paramagnetic Meissner effect (PME), reported to occur in high-Tc materials and in Nb, can be explained by persistence of the giant vortex state with fixed orbital quantum number L. The giant vortex state occurs in type-II superconducting cylinders in parallel fields between the upper critical field H_[c2] and the surface critical field H_[c3]. The authors numerically solved the Ginzburg-Landau equation in cylindrical symmetry for low magnetic fields and found that the PME can occur with decreasing temperature when the magnetic flux trapped in the giant vortex state is compressed. On the other hand, the PME is suppressed and the normal diamagnetic response is recovered when the applied field is increased.
Pictures of intermittently flowing rivers of magnetic flux, obtained by two-dimensional simulations of plastic vortex motion into a sample containing a random distribution of pinning sites, are reported by F. Nori (Michigan). Strong pinning is found to produce a few vortex channels that carry heavy traffic, while weak pinning produces a network of much broader vortex trails.
The motion of periodic lattices, including vortex lattices, driven by an external force in a random pinning potential has been studied theoretically by T. Giamarchi (Orsay) and P. Le Doussal (Ecole Normale Superieure). The authors find that the effects of static disorder persist even at large velocity and result in a moving glass state with topological order analogous to the static Bragg glass. The lattice flows through well-defined, elastically coupled, static channels.
The statics and dynamics of flux lines in a model for YBa2Cu3O7-d have been studied by S. Ryu and D. Stroud (Stanford and Ohio State) using both Monte Carlo simulations and Langevin dynamics. The flux lines are modeled as flexible but unbroken stacks of Josephson-coupled pancake vortices. For a clean system, both approaches yield the same melting curve, which is found to be weakly first order with a heat of fusion of about 0.02 k_BT_m per pancake vortex at a field of 50 kG. The timeaveraged magnetic-field distribution experienced by a fixed spin is found to undergo a qualitative change at freezing, in agreement with NMR and muSR experiments.
The magnetic-field distribution, magnetic flux, and Gibbs free energy of an Abrikosov vortex loop near the flat surface of a type-II superconductor in a parallel magnetic field have been calculated by A. V. Samokhvalov (Nizhny Novgorod). The shape of such a vortex line is a semicircle of arbitrary radius. The results yield the surface barrier and the critical radius for the nucleation and penetration of a halfring into the superconductor.
A microscopic theory for vortex pinning by a single impurity has been developed by M. Friesen and P. Muzikar (Purdue) using a quasiclassical approach allowing for an order parameter with d-wave symmetry. The authors estimate the pinning energy of a single vortex.
YBa2Cu3O7-d
Using dc SQUID magnetization measurements, L. Krusin-Elbaum (IBMYorktown) et al. have determined a new pinning boundary in YBa2Cu3O7-d crystals with columnar defects. This boundary is characterized by (a) a large drop of the persistent current J(T), (b) a maximum in the thermal relaxation rate S(T), and (c) the onset of 1/H field dependence of J(H). This boundary is consistent with the accommodation field B*(T) proposed by Nelson and Vinokur, separating the regime of vortices well localized on columnar pins from the interaction-dominated collective regime. The strong pinning regime is limited by an unexpectedly low vortex depinning temperature T_[dp] ~ 41 K below 0.5 Tc.
As reported by M. Matsukawa (Iwate) et al., the in-plane and out-ofplane thermal conductivities kappa_[ab] and kappa_c of a large single crystal of YBa2Cu3O7-d have been studied as a function of temperature for several annealing conditions. The results strongly support ascribing the observed peak in kappa_[ab] to an electron contribution.
Zn-substitution effects on the c-axis optical spectra have been measured by S. Tajima et al. (SRL-ISTEC) for YBa2Cu3Oy with y = 6.6 and 6.9. The results support an anisotropic superconducting energy gap, such as a dwave gap.
The temperature dependence of the critical current I_c has been investigated by H. Darhmaoui and J. Jung (Alberta) in thin films and ceramics of YBa2Cu3O7-d (YBCO) over a temperature range of 10-90 K and in magnetic fields up to 700 G. The measurements were performed using superconducting rings in a persistent mode. A scanning Hall probe was used to record the profile of the magnetic field across the ring, generated by the persistent current at the critical level. Measurements of I_c vs. temperature revealed a crossover between an AmbegaokarBaratoff-like temperature dependence to a Ginzburg-Landau temperature dependence.
Bi Cuprates
The effects of intercalating HgI2 molecules between the Bi2O2 layers in Bi2Sr2CaCu2O8+d (Bi-2212) have been studied by M.-K. Bae (Pohang) et al. The distance between the CuO2 bilayers could be increased up to 7.2 Angstroms. The superconducting properties, measured in various magnetic fields perpendicular to the layers, could be well explained by the model of Josephson-coupled superconductivity. However, altering the interlayer coupling strength did not drastically change the transition temperature, a result that appears to be inconsistent with Wheatley, Hsu, and Anderson's model in which the transition temperature depends strongly on the rate of coherent hopping of valence bond pairs between CuO2 layers.
A preprint by J. C. Campuzano (Argonne and Illinois-Chicago) et al. presents direct experimental evidence for particle-hole mixing in the angle-resolved photoemission (ARPES) spectra in the superconducting state of Bi-2212. The authors stress that this result establishes unambiguously that the gap observed in ARPES is associated with superconductivity.
Tl Cuprates
The relaxation of the irreversible magnetization in weakly anisotropic polycrystalline Tl0.5Pb0.5Sr2Ca2Cu3O9 [(Tl,Pb)-1223] and a highly anisotropic Tl2Ba2Ca2Cu3O10 (Tl-2223) single crystal has been measured by W. Mexner et al. (Goettingen). The Maley method was used to determine the effective activation energy U_[eff](J) = U_i(Jc/J)^[mu]. The behavior of (Tl,Pb)-1223 could be explained by the 3D collective creep model for not too small currents, while Tl-2223 was found to have 2D behavior.
Hg Cuprates
The equilibrium magnetization in magnetically aligned Hg-based cuprates HgBa2CuO4+d (Hg-1201), HgBa2CaCu2O6+d (Hg-1212), and HgBa2Ca2Cu3O8+d (Hg-1223) with one, two, and three adjacent CuO2 layers has been studied by J. R. Thompson (Oak Ridge) et al. Measurements of the mixed state magnetization, low-field Meissner effect, and normal-state susceptibility permitted a determination of the in-plane characteristic lengths of superconductivity (xi_[ab] and lambda_[ab]) and volume correction factors. The analysis reveals a systematic increase in the slope of the upper critical field -dH_[c2]/dT as the number of CuO2 layers increases, and a nearly constant carrier doping per CuO2 layer.
The temperature dependence of the reversible magnetization in grainaligned HgBa2Ca0.86Sr0.14Cu2O6+d (Hg-1212) has been measured by M.-S. Kim (Pohang and Chungbuk National) et al. with external magnetic fields parallel to the c axis. The magnetization was found to be fieldindependent at T* = 114.5 K, indicating strong thermal vortex fluctuations. Vortex-fluctuation analysis yields a c-axis coherence length of xi_c(0) >= 2 Angstroms and an anisotropy parameter gamma <= 7.7, indicating that this material is an anisotropic three-dimensional superconductor similar to YBa2Cu3O7-d. These results are supported by good 3D scaling behavior of the high-field magnetization around Tc(H) as a function of [T-Tc(H)]/(TH)^[2/3].
Thin Films
The current-voltage (I-V) characteristics and critical scaling behavior in c-axis-oriented YBa2Cu3O7-d films of thickness ranging from 18 nm to 230 nm have been investigated by A. Sawa (ETL-Tsukuba) et al. The authors found that the vortex-glass transition temperature T_g decreased and the width of the critical scaling region increased as the thickness decreased.
Preprints by P. Seidel et al. (Jena) and by F. Machalett (Jena) et al. report on the fabrication of submicron high-Tc superconducting bridges and their modification by ion-beam irradiation. The authors discuss the application of such junctions in dc SQUIDs and gradiometers.
Applications
Electric-field-controlled three-terminal devices (superconducting fieldeffect transistors -- SuFETs) consisting of Au/SrTiO3/YBa2Cu3O7-d heterostructures fabricated by pulsed laser deposition on (100) SrTiO3 have been investigated by R. Schneider et al. (Karlsruhe). Electrical breakthrough, polarization, and the relative dielectric permittivity of the SrTiO3 layer were studied as a function of the applied electric field. The resistivity, superconducting transition temperature, and critical current density of the YBa2Cu3O7-d layer with a thickness of a few unit cells were found to be strongly affected by the electric field. The response time was dominated by the RC time constant of the device, in agreement with the mechanism of direct charge transfer by the electric field, but the devices did not have a voltage gain larger than one. The authors discuss the challenging problems that must be overcome to make these SuFETs attractive for applications.
The fabrication and transport properties of three-terminal Josephson junctions are described in a preprint by J. Mannhart et al. (IBMZurich). The authors note that the devices are excellent Josephson junctions that can be switched and tuned with an applied gate voltage.
Theory
The Ginzburg-Landau equations within a model of (d+s)-wave superconductivity accounting for high-Tc cuprates with orthorhombic distortion have been derived by K. Maki (USC) and M. T. Beal-Monod (Orsay). From these equations, the authors calculate the upper critical field for cases in which the applied magnetic field B is parallel to the c axis or in the ab plane. In the latter case, the upper critical field is predicted to exhibit twofold symmetry, in agreement with a recent experiment in an untwinned YBCO single crystal.
A related paper by M. T. Beal-Monod (Orsay) and K. Maki (USC) uses the (d+s)-wave model to compute the low-temperature electronic thermal conductivity kappa in the presence of impurity scattering in the unitarity limit. The authors predict that (a) kappa is linear in temperature T at low temperature and (b) the thermal conductivity and its anisotropy in the ab plane increase as the impurity concentration increases. The authors also predict a sign reversal in kappa_a kappa_b as the temperature increases.
A preprint by A. A. Abrikosov (Argonne) considers tetragonal superconductors in which the phase of the order parameter has either odd or even symmetry with respect to a pi/2 rotation in the ab plane. The author presents a Tc vs. w phase diagram, where w = 1/tau is the scattering rate by impurities. For small w, the odd-symmetry phase is favored, and Tc is large. For large w, on the other hand, superconductivity is quenched in the odd-symmetry phase, but it persists with a smaller Tc in the even-symmetry phase. The author shows that these results are not qualitatively changed in materials for which there is a small orthorhombic distortion.
As shown by S. G. Ovchinnikov (Krasnoyarsk) in the framework of the multiband p-d model, when Ni substitutes for Cu in the cuprates, the formal Ni^[2+] ion state is not an S = 1 d^8 ion but a mixture of d^9 S = 1/2 and d^[10] S = 0 configurations. The high-spin contribution is eliminated by strong electron correlations.
A preprint by E.V.L. de Mello (Grenoble) studies the phase diagram for high-temperature superconductors by using the Hubbard hamiltonian with a weak attractive interaction. The author's approach yields plots of the critical temperature vs. doping concentration that are in good agreement with the experimental phase diagrams of YBa2Cu3O7-d and La2-xSrxCuO4.
Theoretical results for the screening effect of ohmic and superconducting planar thin films interposed between an excitation loop or coil and a pickup coil of arbitrary geometry are presented in a preprint by J. Gilchrist (Grenoble) and E. H. Brandt (MPI-Stuttgart). The authors treat the superconducting cases in which the film is described via the London equations or the Bean critical state. The authors also treat the case in which the film is a thin, finite circular disk.
Other Activities
The valence of Pr in (Eu1.5-xPrxCe0.5)Sr2Cu2NbO10 compounds has been determined by S. C. Cheng (Northwestern) et al. using electron energyloss spectrometry (EELS) in a transmission electron microscope (TEM). The EELS analysis, in reference to Ce M_[4,5] edges, indicates that the energy onset, the M_5/M_4 intensity ration, and the fine structure of the M_5 and M_4 edges of Pr are consistent with a Pr valence of +3. The authors stress that these results eliminate theoretical descriptions of these compounds in terms of a Pr +4 valence state and a suppression of carrier states. Thus, localized holes, magnetic interactions, and felectron hybridization remain viable candidates to explain the lack of superconductivity in Pr-based cuprates.
Overviews
A survey of recent Raman data on the oxide superconductors and organic superconductors has been prepared by E. Faulques (Nantes). The author describes the cuprate superconductors, in which oxygen ordering is particularly important in YBa2Cu3O7-d, and then presents the fundamentals of Raman spectroscopy and its application to high-Tc superconductors. He discusses Raman studies of oxygen disorder and oxygen underdoping in thin cuprate films. In the final section, the author reviews spectroscopic studies of the organic superconductors (BEDT-TTF)2X and the AxC60 fullerides (102 refs.).
An overview by C. W. Chu (TCSUH) summarizes various results on the HgBa2Ca2-1CunO2n+2+d, Ba-Ca-Cu-O, and Sr-Cu-O systems and discusses the implications regarding the roles of the carrier density, gap symmetry, interlayer coupling mechanism, and instabilities in high-temperature superconductivity (45 refs.).
Some general features of the properties of cuprate phases derived from YBa2Cu3O7-d have been studied by O. Milat (Zagreb) et al. using highresolution electron microscopy and electron diffraction. The studies focused on structures in which Cu atoms in the Cu-O chain layers were replaced by M atoms, where M = Ga, Co, Al, Hg, C, and S. The studies support the concept of the cuprate superconductor as an alternating stack of MO chain layers, whose structure determines the overall symmetry, and pseudo-tetragonal block layers, consisting of CuO2 sheets interleaved by layers of perovskite, rock-salt, or fluorite structure (31 refs.).
Ph.D. Theses
Light-scattering studies of microstructure in bulk YBa2Cu3O7-d and other ceramic superconductors formed the basis of the Monash University Ph.D. thesis of J. M. Long (Deakin). The author found that micro-Raman spectroscopy and optical microscopy techniques work well together. The effect on the spectra of strong laser irradiation also was investigated (670 refs.).
In his Royal Institute of Technology-Stockholm Ph.D. thesis, W. Holm used superconducting fluctuations as a tool to probe the microscopic properties of YBa2Cu3O7-d. The author measured the magnetoconductivity along the c axis and along the layers, including an investigation of ab anisotropy in untwinned YBCO crystals. The roles of Fe and Zn in YBCO also were studied (300 refs.).
Contributed by John R. Clem
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A. A. Abrikosov, "Suppression of the Odd-Parameter Superconductivity by Impurities and the Odd-Even Phase Transition." Submitted to Physica C. Materials Science Division, Building 223, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439.
C. Aruta, G. Balestrino, S. Martellucci, A. Paoletti, and G. Petrocelli, "BaCuO2/SrCuO2 Superlattices by Pulsed Laser Deposition: Growth and Structural Characterization." To be published in Nuovo Cimento D (in press). INFM-Dipartimento di Scienze e Tecnologie Fisiche ed Energetiche, Universita di Roma "Tor Vergata," Via della Ricerca Scientifica, I-00133 Roma, ITALY; G. Balestrino's e-mail balestrino@tovvx1.ccd.utovrm.it.
Myoung-Kwang Bae, Mun-Seog Kim, Sung-Ik Lee, Nam-Gyu Park, Seong-Ju Hwang, Dong-Hoon Kim, and Jin-Ho Choy, "The Effect of HgI2 Intercalation on Bi2Sr2CaCu2Oy: Interlayer Coupling Effect." Submitted to Phys. Rev. B. Department of Physics, Pohang University of Science and Technology, San 31 Hyojadong, Kyungbuk, Pohang 790-784, SOUTH KOREA.
H. S. Barowski, A. Arnold, R. Eder, M. Prenninger, A. Vogenauer, E. V. Pechen, K. F. Renk, W. Prusseit, H. Kinder, R. G. Buckley, D. M. Pooke, and K. Kishio, "Studies of the Residual Absorption of HTSC at Submillimeter Wavelengths by Means of Photothermal Interference Spectroscopy." To be published in Spectroscopic Studies of Superconductors, edited by I. Bozovic and D. van der Marel (SPIE, Bellingham, 1996). Institut fuer Experimentelle und Angewandte Physik, Universitaet Regensburg, D-93040 Regensburg, GERMANY.
M. T. Beal-Monod and K. Maki, "Low Temperature Thermal Conductivity in d+s Wave Superconductivity." Submitted to Physica C. Laboratoire de Physique des Solides, Universite de Paris-Sud, Batiment 510, F-91405 Orsay Cedex, FRANCE; telephone +33 1 69 41-6928 or -6750; telefax +33 1 69 41-6086; e-mail zazie@lps.u-psud.fr. Key words: d-wave superconductor, thermal conductivity.
R. Cabre, Jna. Gavalda, R. Sole, X. Ruiz, M. Aguilo, F. Diaz, and E. Martinez, "YBa2Cu3O6+x and Y2BaCuO5 Composites Obtained by the Partial Melting Zone Method." To be published in Physica C (in press). Contact F. Diaz, Laboratori de Fisica Aplicada i Cristal. Lografia., Universitat Rovira i Virgili, Tarragona, SPAIN; telefax +34 977 55 95 63. Key words: grain alignment (texturing), type-II superconductors, polycrystalline YBCO.
J. C. Campuzano, H. Ding, M. R. Norman, M. Randeria, A. F. Bellman, T. Yokoya, T. Takahashi, H. Katayama-Yoshida, T. Mochiku, and K. Kadowaki, "Direct Observation of Particle-Hole Mixing in the Superconducting State by Angle-Resolved Photoemission." Materials Science Divison, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439.
S. C. Cheng, V. P. Dravid, T. J. Goodwin, R. N. Shelton, and H. B. Radousky, "The Determination of the Valence of Pr in (Eu1.5xPrxCe0.5)Sr2Cu2NbO10 Superconducting Compounds by Electron Energy Loss Spectroscopy." To be published in Phys. Rev. B. Department of Materials Science & Engineering, Science & Technology Center for Superconductivity, Northwestern University, Evanston, IL 60208; telephone (847) 491-2044; telefax (847) 491-7820; e-mail sccheng@merle.acns.nwu.edu.
Jin-Ho Choy, Young-Il Kim, Nam-Gyu Park, and Sung-Ho Hwang, "NanoEngineering via Intercalation: Layer-by-Layer Interstratification of High-Tc Superconducting and Superionic Materials, AgxIyBi2Sr2Can1CunO2n+4 (n = 1,2, and 3)." To be published in Oxide Superconductors: Physics and Nanoengineering II, edited by D. Pavuna and I. Bozovic (SPIE, Bellingham, 1996). Department of Chemistry, Center for Molecular Catalysis, Seoul National University, 151-742 Seoul, SOUTH KOREA. Key words: intercalation, superconducting and superionic conductor, EXAFS, ionic conductivity, ac impedance spectroscopy, pulsed method, mixed conductor.
Jin-Ho Choy, Nam-Gyu Park, Seong-Ju Hwang, Sung-Ho Hwang, and Dong-Hoon Kim, "X-ray Absorption Spectroscopic Study of New High-Tc Superconducting Intercalation Compound of (HgX2)0.5Bi2Sr2CaCu2Oy (X = Br,I)." To be published in Spectroscopic Studies of Superconductors, edited by I. Bozovic and D. van der Marel (SPIE, Bellingham, 1996). Department of Chemistry, Center for Molecular Catalysis, Seoul National University, 151-742 Seoul, SOUTH KOREA. Key words: XAS, HgX2 intercalation, EXAFS, XANES, linear molecule, charge transfer.
C. W. Chu, "Novel High Temperature Superconductors and High Temperature Superconductivity Physics." Preprint #96:011; submitted to the Proc. of the 1995 Taiwan Int. Conf. on Supercond. (TICS '95), Hualien, Taiwa, ROC, Aug. 8-11, 1995; to be published in Chin. J. Phys. 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.
Tom R. Cummins, Michael Schmidt, Dong Hui Lu, Martin Buerk, Stefan Schuppler, F. Lichtenberg, and J. G. Bednorz, "Occupied and Unoccupied Electronic States in a Layered Perovskite Superconductor Without Copper: Band Dispersions, van Hove Singularity and Hole States in Sr2RuO4." To be published in Spectroscopic Studies of Superconductors, edited by I. Bozovic and D. van der Marel (SPIE, Bellingham, 1996). Forschungszentrum Karlsruhe, Institut fuer Nukleare Festkoerperphysik, D-76021 Karlsruhe, GERMANY; telephone +49 7247 82 4588; telefax +49 7247 82 4624; e-mail cummins@infpav4.fzk.de. Key words: layered superconductors, angle-resolved photoemission, extended van Hove singularity, Fermi surface topology, x-ray absorption spectroscopy, electron correlation.
H. Darhmaoui and J. Jung, "Crossover Effects in the Temperature Dependence of the Critical Current in Y1Ba2Cu3O7-d." To be published in Phys. Rev. B. Department of Physics, University of Alberta, Edmonton, Alberta T6G 2J1, CANADA.
Evandro V. L. de Mello, "A Model for High-Temperature Superconductors Using the Extended Hubbard Hamiltonian." To be published in Physica C, Vol. 259 (in press). Centre de Recherche sur les Tres Basses Temperatures, Boite Postale 166, F-38042 Grenoble Cedex, FRANCE; telefax +33 76 87 50 60. Key words: Hubbard hamiltonian, BCS model, phase diagram.
P. Dolez, M. Aubin, J. Cave, D. Willen, and R. Nadi, "Calorimetric ac Loss Measurements of Silver Sheathed Bi-2223 Superconducting Tapes." To be published in Supercond. Sci. & Technol. Contact M. Aubin, Departement de Physique et Centre de Recherche en Physique du Solide, Universite de Sherbrooke, Sherbrooke, Quebec J1K 2R1, CANADA; e-mail maubin@pauli.physique.usherb.ca. 74.25.Fy.
E. Faulques, C. Girault, P. Batail, C. Lenoir, S. Lefrant, and J. P. Buisson, "Intramolecular Phonons of the betaand beta* Phases of the Unlabelled and [13]^C-Labelled (BEDT-TTF)2I3 Organic Superconductor Above and Near Tc." To be published in Spectroscopic Studies of Superconductors, edited by I. Bozovic and D. van der Marel (SPIE, Bellingham, 1996). Laboratoire de Physique Cristalline, Institut des Materiaux de Nantes, 2 rue de la Houssiniere, F-44072 Nantes Cedex 03, FRANCE; telephone +33 40 37 39-72 or -98; telefax +33 40 37 39-91; email faulques@cnrs-imn.fr. Key words: organic superconductors, Raman scattering, BEDT-TTF, isotope shift, triiodides, I_3^-.
Eric Faulques, "Raman Spectra of Unconventional Superconductors." To be published in Materials Synthesis & Characterization (Plenum, 1996). Laboratoire de Physique Cristalline, Institut des Materiaux de Nantes, 2 rue de la Houssiniere, F-44072 Nantes Cedex 03, FRANCE; telephone +33 40 37 39-72 or -98; telefax +33 40 37 39-91; e-mail faulques@cnrs-imn.fr.
E. Faulques and C. Gonzalez, "Raman Spectra of Y(Pr)Ba2Cu3O6+d Thin Films and Oxygen Disorder." To be published in Spectroscopic Studies of Superconductors, edited by I. Bozovic and D. van der Marel (SPIE, Bellingham, 1996). Laboratoire de Physique Cristalline, Institut des Materiaux de Nantes, 2 rue de la Houssiniere, F-44072 Nantes Cedex 03, FRANCE; telephone +33 40 37 39-72 or -98; telefax +33 40 37 39-91; email faulques@cnrs-imn.fr. Key words: high-Tc superconductors, thin films, oxygen disorder, oxygen defects, anomalous phonons, electronphonon coupling, Fano line shapes.
Mark Friesen and Paul Muzikar, "Microscopic Theory of Vortex Pinning: Impurity Terms in the Ginzburg-Landau Free Energy." To be published in Phys. Rev. B, May 1, 1996. Department of Physics, Purdue University, West Lafayette, IN 47907-1396; e-mail friesen@physics.purdue.edu. 74.20.De; 74.20.Fg; 74.60.Ge; 74.20.-z.
T. Giamarchi and P. Le Doussal, "Moving Glass Phase of Driven Lattices." Preprint #LPTENS-95/55; submitted to Phys. Rev. Lett., Dec. 1, 1995. Laboratoire de Physique des Solides, Universite Paris-Sud, Batiment 510, F-91405 Orsay Cedex, FRANCE; P. Le Doussal's telephone at Ecole Normale Superieure, Paris +33 1 47 07 71 46; e-mail ledou@physique.ens.fr; preprint also available at cond-mat@xxx.lanl.gov (#9512006).
John Gilchrist and Ernst Helmut Brandt, "Screening Effect of Ohmic and Superconducting Planar Thin Films." Submitted to Phys. Rev. B, Feb. 22, 1996. Centre de Recherches sur les Tres Basses Temperatures, associe a l'Universite Joseph Fourier, Centre National de la Recherche Scientifique (CNRS), B.P. 166, F-38042 Grenoble Cedex 9, FRANCE. 74.30.Gn; 74.60.Ge.
W. Holm, J. Axnaes, Yu. Eltsev, and Oe. Rapp, "Fluctuation Magnetoconductivity in Fe Doped YBa2Cu3O7-d: Sign Change for B and I Parallel to the Planes." To be published in Physica C. Department of Solid State Physics, Royal Institute of Technology, S-100 44 Stockholm, SWEDEN; telephone +46 8 790 73 02; telefax +46 8 790 69 52; e-mail william@ftf.kth.se. Key words: magnetoresistance, fluctuation effects, anisotropic superconductor, YBa2(Cu1-xFex)3O7-d.
William Holm, "Superconducting Fluctuations as a Tool to Probe Microscopic Properties of YBa2Cu3O7-d." Submitted as a Ph.D. thesis (Dept. of Solid State Physics, Royal Institute of Technology, Stockholm, Sweden, Feb. 1996). Department of Solid State Physics, Royal Institute of Technology, S-100 44 Stockholm, SWEDEN; telephone +46 8 790 73 02; telefax +46 8 790 69 52; e-mail william@ftf.kth.se. Key words: hightemperture superconductors, superconducting fluctuations, magnetoconductivity, paraconductivity, YBa2Cu3O7-d, Fe and Zn doping, anisotropic superconductors.
Stefanie Kaesche, Peter Majewski, and Fritz Aldinger, "Phase Equilibria in the System Bi2O3-PbO-SrO-CaO-CuO with Special Regard to the (Bi,Pb)2+xSr2Ca2Cu3O10+d Phase." To be published in Z. Metallkd. Metallforschung, Pulvermetallurgisches Laboratorium, Heisenbergstrasse 5, D-70569 Stuttgart, GERMANY.
G. Kaiser, H. Brehm, M. Thuerk, and P. Seidel, "Thermodynamic Analysis of an Ideal Four-Valve Pulse Tube Refrigerator." To be published in Cryogenics. Institut fuer Festkoerperphysik, Friedrich-SchillerUniversitaet Jena, Lessingstrasse 8, D-07743 Jena, GERMANY; telephone +49 3641 635773; telefax +49 3641 635681; P. Seidel's e-mail seidel@ifk.uni-jena.de. Key words: cryocooler, pulse tube refrigerator, four-valve principle, thermodynamic analysis, control volume analysis, coefficient of performance.
Mun-Seog Kim, Sung-Ik Lee, Seong-Cho Yu, and Nam H. Hur, "Three Dimensional Superconducting Behaviors and Thermodynamic Parameters of HgBa2Ca0.86Sr0.14Cu2O6-d." Submitted to Phys. Rev. B. Department of Physics, Pohang University of Science and Technology, San 31 Hyojadong, Kyungbuk, Pohang 790-784, REPUBLIC OF KOREA.
S. P. Kruchinin and A. M. Yaremko, "Nonlinear Optical Phenomena of Fullerites." To be published in the Proc. of the Int. Winterschool on Electronic Properties of Novel Materials: Fullerides and Fulleroides (IWEPNM '95), Kirchberg, Tirol, Austria, March 4-11, 1995. Bogolyubov Institute for Theoretical Physics, Ukrainian Academy of Science, Metrologichna Str. 14-b, 252143 Kiev 143, UKRAINE; telephone +7 44 2665362; telefax +7 44 266-5998; e-mail kruchitp@gluk.apc.org.
L. Krusin-Elbaum, L. Civale, J. R. Thompson, and C. Feild, "Accommodation of Vortices to Columnar Defects: Evidence for Large Entropic Reduction of Vortex Localization." Submitted to Phys. Rev. B. IBM Research, Yorktown Heights, NY 10598-0218.
X. S. Ling, H. J. Lezec, M. J. Higgins, J. S. Tsai, J. Fujita, H. Numata, Y. Nakamura, Y. Ochiai, Chao Tang, P. M. Chaikin, and S. Bhattacharya, "Nature of Phase Transitions of Superconducting Wire Networks in a Magnetic Field." To be published in Phys. Rev. Lett. NEC Research Institute, 4 Independence Way, Princeton, NJ 08540; preprint also available at cond-mat@xxx.lanl.gov (#9512035). 74.60.Ge; 64.60.Cn.
John M. Long, "Light Scattering Studies of Microstructure in YBa2Cu3O7-x Superconductors." Submitted as a Ph.D. thesis (Dept. of Physics, Monash University, Clayton, Australia, April 1994). School of Engineering and Technology, Deakin University, Geelong, Victoria 3217, AUSTRALIA; telephone +61 52 27 2896; telefax +61 52 27 2167; e-mail jlong@deakin.edu.au.
F. Machalett, P. Seidel, E. Heinz, E. Steinbiess, T. Eick, K. Steenbeck, W. Brodkorb, and U. Huebner, "Submicron Ion Beam Modification of High-Tc Superconducting Bridges." Submitted to Nucl. Instrum. Meth. Institut fuer Festkoerperphysik, Friedrich-Schiller-Universitaet Jena, Lessingstrasse 8, D-07743 Jena, GERMANY; P. Seidel's telephone +49 3641 635685; telephone and telefax +49 3641 635681; e-mail seidel@ifk.unijena.de. 02.50; 34.00; 74.50.+r; 74.60.Jg; 74.76.Bz.
K. Maki and M. T. Beal-Monod, "Ginzburg Landau Equation and Upper Critical Field in d+s Wave Superconductivity." Submitted to Europhys. Lett. Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089-0484; M. T. Beal-Monod's telephone in Paris, France +33 1 69 41-6928 or -6750; telefax +33 1-69 41-6086; email zazie@lps.u-psud.fr.
Y. M. Malozovsky and J. D. Fan, "A Diagrammatic Approach to the Pairing Instability in an Interacting Fermi Gas." To be published in Oxide Superconductors: Physics and Nanoengineering II, edited by D. Pavuna and I. Bozovic (SPIE, Bellingham, 1996). Department of Physics, Southern University, Baton Rouge, LA 70813. Key words: theory of superconductivity, many-particle physics, electron pairing and instability.
J. Mannhart, B. Mayer, and H. Hilgenkamp, "Fabrication and Transport Properties of Three-Terminal Josephson Junctions Employing High-Tc Superconductors." To be published in Oxide Superconductors: Physics and Nanoengineering II, edited by D. Pavuna and I. Bozovic (SPIE, Bellingham, 1996). IBM Research Division, Zurich Research Laboratory, Saeumerstrasse 4, CH-8803 Rueschlikon, SWITZERLAND. Key words: superconducting devices, electrical field effect, Josephson junctions, three-terminal devices, grain-boundary junctions.
M. Matsukawa, T. Mizukoshi, K. Noto, and Y. Shiohara, "In-Plane and Outof-Plane Thermal Conductivity of a Large Single Crystal of YBa2Cu3O7-x." To be published in Phys. Rev. B (in press). Faculty of Engineeering, Iwate University, 4-3-5 Uedda, Morioka 020, JAPAN. 74.25.Fy.
T. H. Meen, H. D. Yang, W. J. Huang, Y. C. Chen, W. H. Lee, J. H. Shieh, and H. C. Ku, "Ionic-Size Effect on the Structure and Tc of T'-(R1xR'x)1.85Ce0.15CuO4 (R = Pr, Nd, Sm, and Eu; R' = Gd and Y)." To be published in Physica C, Vol. 259 (in press). Contact H. D. Yang, Department of Physics, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, REPUBLIC OF CHINA; telefax +886 7 5310546; e-mail yang@venus.phys.nsysu.edu.tw. 74.62.-c; 74.62.Dh; 74.72.-h.
W. Mexner, J. Hoffmann, S. Heede, K. Heinemann, H. C. Freyhardt, F. Ladenberger, and E. Schwarzmann, "Flux Creep in the Tl-1223 High Temperature Superconductor." To be published in Z. Phys. B. Forschungszentrum Karlsruhe, INFP, Postfach 3640, D-76133 Karlsruhe, GERMANY; telefax +49 721 822857; e-mail mexner@infp.fzk.de.
Ognjen Milat, Gustaaf Van Tendeloo, and Severin Amelinckx, "Structural Description of High-Tc Cuprate Superconductors." To be published in Oxide Superconductors: Physics and Nanoengineering II, edited by D. Pavuna and I. Bozovic (SPIE, Bellingham, 1996). Institute of Physics, University of Zagreb, Bijenicka 46, P.O. Box 304, HR-1001 Zagreb, CROATIA.
V. V. Moshchalkov, X. G. Qiu, and V. Bruyndoncx, "The Paramagnetic Meissner Effect from the Self Consistent Solution of the Ginsburg-Landau Equations." Submitted to Phys. Rev. B. Laboratorium voor VasteStoffysika en Magnetisme, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven, BELGIUM. 74.60.Ec; 74.25.Ha; 74.60.Ge; 74.62.Bf.
J.-P. Mueller, A. Schmalstieg, B. Guettler, A. Schoenhals, J. Schubert, W. Zander, and H.-U. Mueller, "Evidence for the Interaction Between Room-Temperature Annealing After Quenching and Persistent Photoconductivity in Oxygen-Deficient Y1Ba2Cu3Ox Thin Films." To be published in Physica C (in press). Institut fuer Angewandte Chemie Berlin-Adlershof e.V., Rudower Chaussee 5, D-12484 Berlin, GERMANY; telephone +49 30 63 92 42 71; e-mail jpm@aca.fta-berlin.de. Key words: YBaCuO thin films, persistent photoconductivity, annealing.
Hironaru Murakami and Ryozo Aoki, "LT-STM/STS Observation of Definite Superconducting Gap States on the Multistage Crystal Surface of Bi2Sr2CaCu2O8+x." To be published in Spectroscopic Studies of Superconductors, edited by I. Bozovic and D. van der Marel (SPIE, Bellingham, 1996). Department of Electrical Engineering, Faculty of Engineering, Osaka University, Suita, Osaka 565, JAPAN. Key words: STM/STS, Bi2Sr2CaCu2O8+x, layer structure, superconducting gap, gap anisotropy, cleaved surface, electron tunneling.
Franco Nori, "Intermittently Flowing Rivers of Magnetic Flux." To be published in Science. Department of Physics, University of Michigan, Ann Arbor, MI 48109-1120; telephone (313) 764-3271 or -4437; telefax (313) 764-6843 or 763-9694; e-mail nori@umich.edu.
S. G. Ovchinnikov, "Effect of Zn and Ni Substitution on T_N and Tc of Copper Oxides." To be published in Oxide Superconductors: Physics and Nanoengineering II, edited by D. Pavuna and I. Bozovic (SPIE, Bellingham, 1996). L. V. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, Krasnoyarsk, 660036 RUSSIA.
B. J. Ruck, S. Brown, and H. J. Trodahl, "Superconducting Properties of Ta/Ge Multilayers." To be published in Oxide Superconductors: Physics and Nanoengineering II, edited by D. Pavuna and I. Bozovic (SPIE, Bellingham, 1996). Department of Physics, Victoria University of Wellington, P.O. Box 600, Wellington, NEW ZEALAND. Key words: multilayers, amorphous supercondutors, upper critical field, phase diagram, Kosterlitz-Thouless transition.
Seungoh Ryu and D. Stroud, "First-Order Melting and Dynamics of Flux Lines in a Model for YBa2Cu3O7-d." Submitted to Phys. Rev. B. Department of Physics, Ohio State University, Columbus, OH 43210; e-mail ryu@pacific.mps.ohio-state.edu.
S. Sakai, T. Oohira, Y. Kasai, S. Migita, and A. Suzuki, "Nanometer Level Etching and Deposition of Bi-Sr-Ca-Cu-O Superconducting Thin Films." To be published in Oxide Superconductors: Physics and Nanoengineering II, edited by D. Pavuna and I. Bozovic (SPIE, Bellingham, 1996). Electrotechnical Laboratory, 1-1-4 Umezono, Tsukubashi, Ibaraki 305, JAPAN. Key words: BiSrCaCuO superconductor, molecular-beam epitaxy, atomic-absorption spectroscopy, SrO, CaO, thin films, gas-laser etching, digital etching.
A. V. Samokhvalov, "Vortex Loops Entry into Type-II Superconductors." To be published in Physica C, Vol. 259 (in press). Institute for Physics of Microstructures, Russian Academy of Sciences, 603600 Nizhny Novgorod, RUSSIA; telefax +7 8312 675 037; e-mail samokh@ipm.scinnov.ru. Key words: type-II superconductors, mixed state, BeanLivingston barrier, flux pinning, fluctuation effects.
Akihito Sawa, Yasunori Mawatari, Haruhiko Obara, Hirofumi Yamasaki, Masaichi Umeda, Shin Kosaka, and Shigeru Hayashi, "Effect of Thickness Reduction on Vortex-Glass Transition Temperature in YBa2Cu3O7-d Thin Films. To be published in Oxide Superconductors: Physics and Nanoengineering II, edited by D. Pavuna and I. Bozovic (SPIE, Bellingham, 1996). Electrotechnical Laboratory, 1-1-4 Umezono, Tsukubashi, Ibaraki 305, JAPAN. Key words: I-V characteristics, critical scaling, quasi-two-dimensional vortex-glass transition.
Rudolf Schneider, Rainer Auer, and Dietmar Huettner, "Electric Field Effect in Au/SrTiO3/YBa2Cu3O7-x Heterostructures." To be published in Oxide Superconductors: Physics and Nanoengineering II, edited by D. Pavuna and I. Bozovic (SPIE, Bellingham, 1996). Forschungszentrum Karlsruhe, Institut fuer Nukleare Festkoerperphysik, P.O.B. 3640, D76021 Karlsruhe, GERMANY. Key words: pulsed-laser deposition, high-Tc cuprate films, dielectric thin films, thin-film heterostructures, electric field effect.
Paul Seidel, Frank Schmidl, Frank Machalett, Henrik Schneidewind, Andreas Pfuch, and Uwe Huebner, "Preparation and Properties of Two Types of Submicron High-Tc Josephson Junctions." Submitted to the Proc. of the SPIE Photonics West '96 Symp., San Jose, CA, Jan. 27-Feb. 2, 1996. Institut fuer Festkoerperphysik, Friedrich-Schiller-Universitaet Jena, Lessingstrasse 8, D-07743 Jena, GERMANY; telephone +49 3641 635685; telephone and telefax +49 3641 635681; e-mail seidel@ifk.uni-jena.de. Key words: Josephson devices, weak links, high-Tc superconducting films, SQUIDs, ion beams, submicron technology.
S. N. Song, S. R. Maglic, C. Thomas, E. D. Rippert, P. R. Auvil, M. Ulmer, and J. B. Ketterson, "Studies of Static and Dynamic Properties of Multilayered (Stacked) Josephson Junctions." To be published in Oxide Superconductors: Physics and Nanoengineering II, edited by D. Pavuna and I. Bozovic (SPIE, Bellingham, 1996). Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208. Key words: Josephson junctions, stacked junctions, vortex structure.
S. Tajima, R. Hauff, and W.-J. Jang, "Zn-Substitution Effects on the Optical Conductivity of YBa2Cu3Oy." To be published in Spectroscopic Studies of Superconductors, edited by I. Bozovic and D. van der Marel (SPIE, Bellingham, 1996). Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 10-13 Shinonome 1-chome, Koto-ku, Tokyo 135, JAPAN; telephone +81 3 3536-5703 through -5705; telefax +81 3 3536-5714 or -5717. Key words: high-Tc superconductors, Zn substitution, optical spectrum superconducting gap, spin gap.
M. Tetenbaum and V. A. Maroni, "Some Aspects of the Thermodynamic Behavior of the Lead-Doped Bi-2223 System." To be published in Physica C (in press). Chemical Technology Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telefax (708) 252-9373.
J. R. Thompson, J. G. Ossandon, D. K. Christen, M. Paranthaman, E. D. Specht, and Y. C. Kim, "Characteristic Length Scales and Fields of HgBased High-Tc Superconductors." Submitted to Phys. Rev. B. Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6061. 74.25.Ha; 74.60.Ec; 74.72.Gr; 74.60.-w.
N. V. Vo, S. X. Dou, and H. K. Liu, "Effect of Rolling Reduction on the Transport Property, Microstructure, Phase Formation and Fill Factor of High-Tc Superconducting Bi-(Pb)-Sr-Ca-Cu-O Tapes." To be published in Cryogenics. Centre for Superconducting and Electronic Materials, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, AUSTRALIA.
Ian Wooldridge, Mark A. Howson, Andrea Gauzzi, Davor Pavuna, and Daron J. C. Walker, "Comparison of the E-J Characteristics of Several YBa2Cu3O7-d Thin Films." To be published in Physica C (in press). Department of Physics, University of Leeds, Leeds LS2 9JT, UNITED KINGDOM.
Akio Yamanaka, Nobuo Asayama, Takashi Furutani, Kuon Inoue, and Shunji Takekawa, "Investigation of Low-Energy Electronic Response in High-Tc Superconductor by Raman Spectroscopy." To be published in Spectroscopic Studies of Superconductors, edited by I. Bozovic and D. van der Marel (SPIE, Bellingham, 1996). Research Institute for Electronic Science, Hokkaido University, Sapporo 060, JAPAN.
W. J. Yu, Z. Q. Mao, X. M. Liu, M. L. Tian, G. E. Zhou, and Y. H. Zhang, "Electronic Structure of the Ba-Doped (Pb,Cd)-1212 Cuprates." To be published in Physica C (in press). Faculty of Chemistry and Chemical Engineering, Suzhou University, Suzhou 215006, PEOPLE'S REPUBLIC OF CHINA.
*June 15 - 17, 1996: 1996 Electronic Structure Workshop, Hubert H. Humphrey Center, University of Minnesota, Minneapolis, MN. Representative topics will include: large-N methods, pseudopotentials, quantum Monte Carlo methods, methods for quantum molecular dynamics, basis-sets methods, real-space methods, parallel computing, densityfunctional theory, etc. Speakers to be selected by the organizing committee in early 1996. Suggestions welcome. Poster session open to all attendees. Abstract deadline, May 1, 1996. Further information available at home page http://www.cems.umn.edu/~jrc/es96.html. Information also available from James R. Chelikowsky, Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue S.E., Minneapolis, MN 55455; email jrc@msi.umn.edu. Or contact Michael Olesen, Symposium Administrator, University of Minnesota, Supercomputer Institute, 1200 Washington Avenue South, Minneapolis, MN 55415; telephone (612) 624-1356; telefax (612) 624-9565; email olesen@msi.umn.edu.
*July 13 - 20, 1996: 2nd International Summer School on High Temperature Superconductivity, Eger, Hungary. Organized by the Hungarian Chapter of Superconductivity Society. Will cover a wide range of topics in high-Tc superconductors from basic theories to engineering applications. Main aim is to give a comprehensive and updated knowledge to Ph.D. students and research scientists already involved in HTS work. Lectures to be given by outstanding scientists in the field. The following topics will be included: ten years of high-Tc superconductivity, survey of theories on high-Tc superconductivity, physical properties of HTS materials, characterization and measurements of the physical properties, new trends in preparation techniques, crystal structure of HTS materials, interdependence of the physical properties and morphology, manufacturing of HTS conductors, and smalland large-scale applications. Language of the Summer School is English. Papers to be published. For information, contact Istvan Vajda, Department of Electrical Machines and Drives, Technical University of Budapest, Egry Jozsef utca 18., H-111 Budapest, Hungary; telephone +36 1 463-2961; telefax +36 1 463-3600; e-mail vajda@ntb.bme.hu. 12/15/95
*July 22 - 26, 1996: Conference on Quantum Coherence in Strongly Correlated Fermion Systems, Scuola Normale Superiore, Pisa, Italy. Satellite of XXI International Conference on Low Temperature Physics (LT21), Prague, August 8-14, 1996. Sponsored by the INFM (Istituto Nazionale di Fisica della Materia). Purpose of the conference is to bring together scientists working on different but related topics of condensed-matter and statistical physics to allow for a "productive cross-fertilization." Topics will include disordered systems (Anderson localization and electron-electron interaction, spin-glass, and neural network); strongly correlated electron systems (metal-insulator transition; non-Fermi-liquid metallic phase, and superconductivity); quantum chaos and mesoscopic systems; renormalization group in Fermion systems; and exact results and relation with field theory. Participation restricted to eighty persons. Deadline for participation request, April 30, 1996. Request for participation and proposed contributions (including fax number and e-mail of the applicant) should be sent to M. Grilli, Universita' di Roma "La Sapienza," Piazza A. Moro, 2, I-00185 Rome, Italy; telephone 39-6-4991-4341; telefax 39-6-4957697; e-mail grilli@roma1.infn.it.
*Aug. 2 - 6, 1996: International Conference on Physics and Chemistry of Molecular and Oxide Superconductors (MOS'96), Karlsruhe, Germany. Satellite to the LT21 conf. to be held in Prague, Czech Republic, Aug. 8-14, 1996. MOS'96 is a successor to similar conferences held in Eugene, OR (1993) and Cambridge, U.K. (1990). Topics will include fundamental properties of molecular and oxide superconductors such as cuprate and related compounds, organic superconductors, fullerenes, and borocarbides; normal-state properties; mechanism and theory of superconductivity; synthesis and processing; and new superconducting compounds. Proceedings will be published as a special volume of J. Low Temp. Phys. Program chair: H. Rietschel. Abstract deadline, April 1, 1996; early registration deadline, June 1, 1996. For further information, contact Mrs. E. Maass, MOS'96 Conference Secretary, Institut fuer Nukleare Festkoerperphysik, Forschungszentrum Karlsruhe, Postfach 3640, D-76021 Karlsruhe, Germany; telephone +49 7247 822421; telefax +49 7247 824624.
*Aug. 19 - 31, 1996: Materials Aspects of High Tc Superconductivity: Ten Years after the Discovery, NATO Advanced Study Institute, European Cultural Center, Delphi, Greece. Purpose is to commemorate the 10th anniversary of this discovery by discussion of latest results in the HTS field. Particular emphasis on strong interaction between superconductivity and the materials properties of the cuprates. Lectures to include discussion of phase-separation problems and structural and electronic inhomogeneities (superstructures, staging, phase transitions, etc.). Lecturers will include G. Bednorz, Y. Berthier, A. Bianconi, M. C. Crawford, P. Edwards, A. Furrer, D. C. Johnston, M. Kastner, M. Marezio, K. A. Mueller, B. Raveau, H. Rietschel, Z. Schlesinger, and Z. X. Zhao. Closing date for applications, March 20, 1996. For information, contact Prof. E. Kaldis, Labor. fuer Festkoerperphysik ETH, CH-8093 Zurich, Switzerland; telephone +41 1 633 22 51; telefax +41 1 633 11 26; e-mail kaldis@solid.phys.ethz.ch.
*Aug. 25 - 30, 1996: The 1996 Applied Superconductivity Conference, Pittsburgh Convention Center, Pittsburgh, PA. Hosted by Westinghouse Science and Technology Center. Major areas: superconducting materials for a wide range of applications, superconducting electronics, and large-scale applications. Celebration luncheon commemorating the 10th anniversary of the discovery of HTS materials will feature distinguished speakers in the field including Paul Chu, Ted Van Duzer, and David Larbalestier. The 1996 meeting will use both oral and poster formats for invited presentations. For information, contact William Shoemaker, Conference Manager, AHI Conference Management, Hudsons Cross Roads, Selbyville, DE 19975; telephone (800) 788-7077; telefax (302) 436-1911; e-mail convene@ aol.com.
Information
Proceedings: Neutron Scattering in Materials II, edited by Dan A. Neumann, Thomas P. Russell, and Bernhardt J. Wuensch. Volume 376 of MRS Symposium Proceedings Series, contains 108 papers from 1994 MRS Fall Meeting in Boston, MA. This volume includes research results of scientists and engineers from twenty-one countries and discusses the growth and maturation of the use of neutrons as a probe in materials research and to survey current applications. Materials examined include polymers, cements, high-Tc superconducting oxides and carbides, inorganic glasses, magnetic films, ceramics, and metallic alloys. Topics include instrumentation at major neutron facilities in North America; development in instrumentation and techniques; neutron reflectivity studies of surfaces and interfaces; small-angle neutron scattering (SANS) studies of polymers, complex fluids, ceramics, and metals; residual stress analysis; cementitious materials; high-Tc superconducting materials; interfaces, multilayers, and nanocrystals of magnetic materials; oxide materials; inorganic glasses; alloys; and adsorbed systems, inelastic scattering, and dynamics. Publ. 1996; 795 pp.; price $67 (members), $77 (US List), and $82 (non-US List); ISBN 155899-278-2. Contact the Materials Research Society, Customer Services Dept., 9800 McKnight Road, Pittsburgh, PA 15237-6006; telephone (412) 367-3012; telefax (412) 367-4373.
Products and Services
Two superconductivity educational kits, a junior-high/middle-school version and a high-school version are available through DOE's Energy Efficiency and Renewable Energy Clearinghouse. Both kits include a teacher's guide and a 12-minute videotape titled, "An Introduction to Superconductivity." To receive a kit free of charge, call the Clearinghouse at (800) 363-3732 or send e-mail to energyinfo@delphi.com and request the kit version of your choice.
New WWW site: Southern Chemical Group, (SCG) has created this site for persons interested in the purchase of fullerene materials. The URL is http://www.southchem.com/. Consists of listing of fullerene prices. Contact scgchem@america.net.
The information contained herein is intended for limited distribution. Readers are expected to respect the rights of the authors.
Please address all contributions and inquiries to: Dr. Sreeparna Mitra, A219 Physics, Ames Laboratory/Iowa State University, Ames, Iowa 50011-3020. Telephone: (515) 294-3877. Telefax: (515) 294-1134. Telex: 269266. E-mail: MITRA@AMESLAB.GOV or MITRpA@IASTATE.EDU.
Project Director/Editor: Sreeparna Mitra
Science Editor: John R. Clem
High-Tc Update, Vol. 10, #6, March 15, 1996.