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Condensed Matter papers — page 267

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Current-Induced Chiral Phase Transition in a Josephson-Junction Array
It is predicted that the fully frustrated Josephson-junction array on a square lattice with alternating columns of junctions having a reduced critical current Iweak=μI0(with μ<1 and I0…
M. V. SimkinApr 30, 1996
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Impurity scattering and localization in d-wave superconductors
Strong evidence is presented for the localization of low energy quasiparticle states in disordered d-wave superconductors. Within the framework of the Bogoliubov-de Gennes (BdG) theory applied to…
M. Franz, C. Kallin, A. J. BerlinskyApr 30, 1996
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Long Wavelength Instability for Uniform Shear Flow
Uniform Shear Flow is a prototype nonequilibrium state admitting detailed study at both the macroscopic and microscopic levels via theory and computer simulation. It is shown that the hydrodynamic…
Mirim Lee, James W. Dufty, José M. Montanero et al.Apr 30, 1996
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Nonlocal Conductivity in the Vortex-Liquid Regime of a Two-Dimensional Superconductor
We have simulated the time-dependent Ginzburg-Landau equation with thermal fluctuations, to study the nonlocal dc conductivity of a superconducting film. Having examined points in the phase diagram…
Rachel Wortis, David A. HuseApr 30, 1996
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Resistance of superconductor-normal metal-superconductor junctions
It is shown that the conductance of a superconductor-normal metal-superconductor junction can exhibit a significant dependence on the phase of the superconducting order parameter in the situation…
F. Zhou, B. SpivakApr 30, 1996
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Glassy Motion of Elastic Manifolds
We discuss the low-temperature dynamics of an elastic manifold driven through a random medium. For driving forces well below the T=0 depinning force, the medium advances via thermally activated…
Valerii M. Vinokur, M. Cristina Marchetti, Lee-Wen ChenApr 30, 1996
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A Microscopic Derivation of the Critical Magnetic Field in a Superconductor
The propagator for a noninteracting many electron system in a constant magnetic field in three space time dimensions is computed. This formula and the results of [FT1,2] are used to give a…
Detlef LehmannApr 30, 1996
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Investigation of the Spin-Peierls transition in CuGeO3 by Raman scattering
Raman experiments on the spin-Peierls compound CuGeO3 and the substituted (Cu1- x,Znx)GeO3 and Cu(Ge1-x,Gax)O3 compounds were performed in order to investigate the response…
P. Lemmens, B. Eisener, M. Brinkmann et al.Apr 30, 1996
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Computer simulation of crystallization kinetics with non-Poisson distributed nuclei
The influence of non-uniform distribution of nuclei on crystallization kinetics of amorphous materials is investigated. This case cannot be described by the well-known Johnson-Mehl-Avrami (JMA)…
Patric Uebele, Helmut HermannApr 30, 1996
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Comment on "Voltage-Current Characteristics of the Two-Dimensional Gauge Glass Model"
Li (Phys. Rev. Lett. 69,1819 (1992)) has computed the current-voltage characteristics (CVC) of a disordered two-dimensional (2D) Josephson-junction array and claimed that his data(nonlinear CVC…
M. V. SimkinApr 30, 1996
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Indications of a Metallic Antiferromagnetic Phase in the 2 Dimensional U-t-t' Model
We present mean-field and quantum Monte Carlo results that suggest the existence of an itinerant antiferromagnetic ground state in the half-filled U-t-t' model in two dimensions. In particular,…
Daniel Duffy, Adriana MoreoApr 29, 1996
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Variational Monte Carlo and Configurational Interaction Studies of C60 and its Fragments
The C60 molecule and its fragments are studied using Configuration Interaction (CI) and Variational Monte Carlo (VMC) techniques, within the Hubbard model. Using benzene as a test case, we…
Bhargavi Srinivasan, S. Ramasesha, H. R. KrishnamurthyApr 29, 1996
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Long-range effects on optical absorption in quasiperiodic lattices
We consider exciton optical absorption in quasiperiodic lattices, focusing our attention on the Fibonacci case as typical example. The absorption spectrum is evaluated by solving numerically the…
Francisco Dominguez-AdameApr 29, 1996
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Nonzero Fermi Level Density of States for a Disordered d-Wave Superconductor
It has been known for some time that, in three dimensions, arbitrarily weak disorder in unconventional superconductors with line nodes gives rise to a nonzero residual density of zero-energy…
Klaus Ziegler, Matthias H. Hettler, Peter J. HirschfeldApr 29, 1996
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Multi-configurational Symmetrized Projector Quantum Monte Carlo Studies of excited states of the Hubbard model
We develop a novel multi-configurational Symmetrized Projector Quantum Monte Carlo (MSPQMC) method to calculate excited state properties of Hubbard models. We compare the MSPQMC results for finite…
Bhargavi Srinivasan, S. Ramasesha, H. R. KrishnamurthyApr 29, 1996
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Dissipative Chaos in Semiconductor Superlattices
We consider the motion of ballistic electrons in a miniband of a semiconductor superlattice (SSL) under the influence of an external, time-periodic electric field. We use the semi-classical…
Kirill N. Alekseev, Gennady P. Berman, David K. Campbell et al.Apr 29, 1996
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Field-driven topological glass transition in a model flux line lattice
We show that the flux line lattice in a model layered HTSC becomes unstable above a critical magnetic field with respect to a plastic deformation via penetration of pairs of point-like disclination…
Seungoh Ryu, A. Kapitulnik, S. DoniachApr 29, 1996
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Unconventional Ferromagnetic Transition in La1-xCaxMnO3
Neutron scattering has been used to study the magnetic correlations and long wavelength spin dynamics of La1-xCaxMnO3 in the ferromagnetic regime (0<=x<1/2). For x=1/3 (Tc=250K) where the…
J. W. Lynn, R. W. Erwin, J. A. Borchers et al.Apr 29, 1996
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Percolation and cluster Monte Carlo dynamics for spin models
A general scheme for devising efficient cluster dynamics proposed in a previous letter [Phys.Rev.Lett. 72, 1541 (1994)] is extensively discussed. In particular the strong connection among equilibrium…
V. Cataudella, G. Franzese, M. Nicodemi et al.Apr 29, 1996
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Kondo lattice model: Unitary transformations, spin dynamics, strongly correlated charged modes, and vacuum instability
Using unitary transformations, we express the Kondo lattice Hamiltonian in terms of fermionic operators that annihilate the ground state of the interacting system and that represent the best possible…
J. M. Prats, F. Lopez-AguilarApr 29, 1996
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Critical dimensions for random walks on random-walk chains
The probability distribution of random walks on linear structures generated by random walks in d-dimensional space, Pd(r,t), is analytically studied for the case ξ r/t1/41. It is…
Savely Rabinovich, H. Eduardo Roman, Shlomo Havlin et al.Apr 29, 1996
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Scaling above the upper critical dimension in Ising Models
We rederive the finite size scaling formula for the apparent critical temperature by using Mean Field Theory for the Ising Model above the upper critical dimension. We have also performed numerical…
Giorgio Parisi, Juan J. Ruiz-LorenzoApr 29, 1996
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Conductance Increase by Electron-Phonon Interaction in Quantum Wires
We investigate the influence of electron-phonon interactions on the DC-conductance Γ of a quantum wire in the limit of one occupied subband. At zero temperature, a Tomonaga-Luttinger-like…
Tobias Brandes, Arisato KawabataApr 28, 1996
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Magnetoresistance of Two-Dimensional Fermions in a Random Magnetic Field
We perform a semiclassical calculation of the magnetoresistance of spinless two-dimensional fermions in a long-range correlated random magnetic field. In the regime relevant for the problem of the…
D. V. KhveshchenkoApr 27, 1996
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Surface Waves and Forced Oscillations in QHE Planar Samples
Dispersion relations and polarizations for surface waves in infinite planar samples in the QHE regime are explicitly determined in the small wavevector limit in which the dielectric tensor can be…
A. Cabo, A. Correa, R. Guevara et al.Apr 26, 1996
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