Percolation transition of the vortex lattice and c-axis resistivity in high-temperature superconductorsWe use the three-dimensional Josephson junction array system as a model for studying the temperature dependence of the c-axis resistivity of high temperature superconductors, in the presence of an…E. A. Jagla, C. A. Balseiro·Jul 3, 1995SaveLearn
Flux Creep and Flux JumpingWe consider the flux jump instability of the Bean's critical state arising in the flux creep regime in type-II superconductors. We find the flux jump field, Bj, that determines the…R. G. Mints·Jul 2, 1995SaveLearn
The Flux-Line Lattice in SuperconductorsMagnetic flux can penetrate a type-II superconductor in form of Abrikosov vortices. These tend to arrange in a triangular flux-line lattice (FLL) which is more or less perturbed by material…Ernst Helmut Brandt·Jun 22, 1995SaveLearn
First-Order Vortex Lattice Melting and Magnetization of YBa2Cu3O$7-δWe present the first non-mean-field calculation of the magnetization M(T) of YBa2Cu3O7-δ both above and below the flux-lattice melting temperature Tm(H). The results are in good…R. Sasik, D. Stroud·Jun 20, 1995SaveLearn
Quantum Resistive Transition in Type II Superconductors under Magnetic FieldIt is shown that, within a Ginzburg-Landau (GL) formalism, the superconducting fluctuation is insulating at zero temperature even if the fluctuation dynamics is metallic (dissipative). Based on this…Ryusuke Ikeda·Jun 16, 1995SaveLearn
Neutron Scattering Study of Crystal Field Energy Levels and Field Dependence of the Magnetic Order in Superconducting HoNi2B2CElastic and inelastic neutron scattering measurements have been carried out to investigate the magnetic properties of superconducting (Tc~8K) HoNi2B2C. The inelastic measurements reveal that the…T. E. Grigereit, J. W. Lynn, R. J. Cava et al.·May 23, 1995SaveLearn
Superconductivity from correlated hoppingWe consider a chain described by a next-nearest-neighbor hopping combined with a nearest-neighbor spin flip. In two dimensions this three-body term arises from a mapping of the three-band Hubbard…C. D. Batista, F. Lema, A. A. Aligia·May 10, 1995SaveLearn
Microwave Surface Impedance of YBCO:123 crystals: Experiment and comparison to a d-wave modelWe present measurements of the microwave surface resistance Rs and the penetration depth lambda of YBCO:123 crystals. At low T obeys lambda(T) a polynomial behavior, while Rs displays a…T. Jacobs, S. Sridhar, C. T. Rieck et al.·Apr 21, 1995SaveLearn
Microwave Properties of Borocarbide Superconductors LnNi2B2C (Ln = Y, Er, Tm, Ho)We report measurements of the microwave surface impedance of the borocarbide family of superconductors LnNi2B2C (Ln=Y, Er, Tm, Ho). The experiments enable direct measurements of the superfluid…T. Jacobs, Balam A. Willemsen, S. Sridhar et al.·Apr 21, 1995SaveLearn
Self-Organized Criticality Effect on Stability: Magneto-Thermal Oscillations in a Granular YBCO SuperconductorWe show that the self-organized criticality of the Bean's state in each of the grains of a granular superconductor results in magneto-thermal oscillations preceding a series of subsequent flux…L. Legrand, I. Rosenman, R. G. Mints et al.·Mar 19, 1995SaveLearn
Two-hole bound states in modified t-J modelWe consider modified t-J model with minimum of single-hole dispersion at the points (0, π), ( π,0). It is shown that two holes on antiferromagnetic background produce a bound state which…M. Yu. Kuchiev, O. P. Sushkov·Feb 28, 1995SaveLearn
Verification of a New Non-Linear IV-exponent: Simulation of the 2D Coulomb Gas with Langevin Dynamics.It has recently been suggested from scaling arguments that the non-linear IV-exponent a, for a two-dimensional superconductor is different from the exponent originally suggested by Ambegaokar et al.…Kenneth Holmlund, Petter Minnhagen·Feb 27, 1995SaveLearn
Anomalous Normal-State Properties of High-Tc Superconductors -- Intrinsic Properties of Strongly Correlated Electron Systems?A systematic study of optical and transport properties of the Hubbard model, based on Metzner and Vollhardt's dynamical mean-field approximation, is reviewed. This model shows interesting…Th. Pruschke, M. Jarrell, J. K. Freericks·Feb 22, 1995SaveLearn
Phonon Assisted Multimagnon Optical Absorption and Long Lived Two-Magnon States in Undoped Lamellar Copper OxidesWe calculate the effective charge for multimagnon infrared (IR) absorption assisted by phonons in the parent insulating compounds of cuprate superconductors and the spectra for two-magnon absorption…J. Lorenzana, G. A. Sawatzky·Jan 19, 1995SaveLearn
Multiple Scattering Analysis of Cu-K EXAFS in Bi2Sr1.5Ca1.5Cu2O8+dWe have analyzed the Cu K-EXAFS of Bi2Sr1.5Ca1.5Cu2O8+d using a full multiple scattering analysis in a cluster with diameter d = 7.6 AA. The numerous quasi one-dimensional structural elements…J. R"ohler, R. Cr"usemann·Dec 31, 1994SaveLearn
Onset of Vortices in Thin Superconducting Strips and WiresSpontaneous nucleation and the consequent penetration of vortices into thin superconducting films and wires, subjected to a magnetic field, can be considered as a nonlinear stage of primary…I. Aranson, M. Gitterman, B. Ya. Shapiro·Dec 26, 1994SaveLearn
Density of states of a layered S/N d-wave superconductorWe calculate the density of states of a layered superconductor in which there are two layers per unit cell. One of the layers contains a d-wave pairing interaction while the other is a normal metal.…W. A. Atkinson, J. P. Carbotte·Nov 8, 1994SaveLearn
Spin Dynamics of La2CuO4 and the Two-Dimensional Heisenberg ModelThe spin-lattice relaxation rate 1/T1 and the spin echo decay rate 1/T2G for the 2D Heisenberg model are calculated using quantum Monte Carlo and maximum entropy analytic continuation. The…A. W. Sandvik, D. J. Scalapino, UC Santa Barbara·Nov 8, 1994SaveLearn
Spin pseudo-gap and interplane coupling in Y2Ba4Cu7O15: a 63Cu nuclear spin-spin relaxation studyWe report measurements of the Gaussian contribution, T2G, to the plane 63Cu nuclear spin--spin relaxation time in the YBa2Cu3O7 and YBa2Cu4O8 blocks of normal and superconducting…R. Stern, M. Mali, J. Roos et al.·Nov 2, 1994SaveLearn