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Condensed Matter papers — page 233

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Freezing Transition of Compact Polyampholytes
Polyampholytes (PAs) are heteropolymers with long range Coulomb interactions. Unlike polymers with short range forces, PA energy levels have non-vanishing correlations and are thus very different…
Vijay S. Pande, Alexander Yu. Grosberg, Chris Joerg et al.Sep 5, 1996
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Universality in Transport Processes of Unconventional Superconductors
We show that some of the low temperature transport coefficients (e.g., electrical and thermal conductivities, viscosity and sound attenuation) are universal, i.e., independent of the impurity…
M. J. Graf, S. -K. Yip, J. A. SaulsSep 5, 1996
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Strong-coupling approach to ground-state properties of the Anderson lattice-model
A Slave-Boson perturbational approach to ground-state properties of the U∞ periodic Anderson model is derived as an expansion around the Atomic Limit (V=0). In the case of zero…
Jan BrinckmannSep 5, 1996
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Non-ideal Boson system in the Gaussian approximation
We investigate ground-state and thermal properties of a system of non-relativistic bosons interacting through repulsive, two-body interactions in a self-consistent gaussian mean-field approximation…
Paolo Tommasini, A. F. R. de Toledo PizaSep 5, 1996
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Magnetization switching in nanoscale ferromagnetic grains: simulations with heterogeneous nucleation
We present results obtained with various types of heterogeneous nucleation in a kinetic Ising model of magnetization switching in single-domain ferromagnetic nanoparticles. We investigate the effect…
M. Kolesik, H. L. Richards, M. A. Novotny et al.Sep 5, 1996
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Temperature-dependent spin gap and singlet ground state in BaCuSi2O6
Bulk magnetic measurements and inelastic neutron scattering were used to investigate the spin-singlet ground state and magnetic gap excitations in BaCuSi2O6, a quasi-2-dimensional antiferromagnet…
Y. Sasago, K. Uchinokura, A. Zheludev et al.Sep 5, 1996
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Cumulant Expansions and the Spin-Boson Problem
The dynamics of the dissipative two-level system at zero temperature is studied using three different cumulant expansion techniques. The relative merits and drawbacks of each technique are discussed.…
D. R. Reichman, F. L. H. Brown, P. NeuSep 5, 1996
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Thermally assisted quantum cavitation in solutions of 3He in 4He
We have investigated the quantum-to-thermal crossover temperature T* for cavitation in liquid helium mixtures up to 0.05 3He concentrations. With respect to the pure 4He case, T* is sizeably reduced,…
D. Jezek, M. Guilleumas, M. Pi et al.Sep 5, 1996
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Accurate evaluation of the interstitial KKR-Green function
It is shown that the Brillouin zone integral for the interstitial KKR-Green function can be evaluated accurately by taking proper care of the free-electron singularities in the integrand. The…
J. P. Dekker, A. Lodder, R. Zeller et al.Sep 5, 1996
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Irreversible Adsorption of particles after diffusing in a gravitational field
In this paper we analyze the influence of transport mechanisms (diffusion and sedimentation) on the structure of monolayers of particles irreversibly adsorbed on a line. We focus our attention on the…
Jordi Faraudo, Javier BafaluySep 5, 1996
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Nonuniversal scaling behavior of Barkhausen noise
We simulate Barkhausen avalanches on fractal clusters in a two-dimensional diluted Ising ferromagnet with an effective Gaussian random field. We vary the concentration of defect sites c and find a…
Bosiljka TadicSep 5, 1996
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Quantum cavitation in liquid helium
Using a functional-integral approach, we have determined the temperature below which cavitation in liquid helium is driven by thermally assisted quantum tunneling. For both helium isotopes, we have…
M. Guilleumas, M. Barranco, D. M. Jezek et al.Sep 5, 1996
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Topological Order in the Phase Diagram for High-Temperature Superconductors with Point Defects
Applying a Lindemann-like criterion obtained previously by Kierfeld, Nattermann and Hwa [Phys. Rev. B 55, 626 (1997)], we estimate the magnetic field and temperature for a high-Tc superconductor,…
J. KierfeldSep 4, 1996
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Effects of Nonmagnetic Impurity Doping on Spin Ladder System
Effects of nonmagnetic impurity doping on an AF spin-1/2 Heisenberg ladder system are studied by the QMC method. A single nonmagnetic impurity induces a localized spin-1/2 moment accompanied by…
Youichirou Iino, Masatoshi ImadaSep 4, 1996
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Theory of Neutron Diffraction from the Vortex Lattice in UPt3
Neutron scattering experiments have recently been performed in the superconducting state of UPt3 to determine the structure of the vortex lattice. The data show anomalous field dependence of the…
Robert JoyntSep 4, 1996
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Dimensional crossover and metal-insulator transition in quasi-two-dimensional disordered conductors
We study the metal-insulator transition (MIT) in weakly coupled disordered planes on the basis of a Non-Linear Sigma Model (NLσM). Using two different methods, a renormalization group (RG) approach…
N. DupuisSep 4, 1996
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Solution of the Master Equation for Bak-Sneppen Model of Biological Evolution in Finite Ecosystem
The master equations describing processes of biological evolution in the framework of the random neighbor Bak-Sneppen model are studied. For the eqosystem of N species they are solved exactly and…
Yu. M. Pis`makSep 4, 1996
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A quantitative test of the mode-coupling theory of the ideal glass transition for a binary Lennard-Jones system
Using a molecular dynamics computer simulation we determine the temperature dependence of the partial structure factors for a binary Lennard-Jones system. These structure factors are used as input…
Markus Nauroth, Walter KobSep 4, 1996
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Rodrigues Formula for Hi-Jack Symmetric Polynomials Associated with the Quantum Calogero Model
The Hi-Jack symmetric polynomials, which are associated with the simultaneous eigenstates for the first and second conserved operators of the quantum Calogero model, are studied. Using the algebraic…
Hideaki Ujino, Miki WadatiSep 4, 1996
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Monte Carlo calculation of the linear resistance of a three dimensional lattice Superconductor model in the London limit
We have studied the linear resistance of a three dimensional lattice Superconductor model in the London limit London lattice model by Monte Carlo simulation of the vortex loop dynamics. We find…
Hans Weber, Henrik Jeldtoft JensenSep 4, 1996
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Spectral Rigidity and Eigenfunction Correlations at the Anderson Transition
The statistics of energy levels for a disordered conductor are considered in the critical energy window near the mobility edge. It is shown that, if critical wave functions are multifractal, the…
J. T. Chalker, V. E. Kravtsov, I. V. LernerSep 4, 1996
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Stress condensation in crushed elastic manifolds
We discuss an M-dimensional phantom elastic manifold of linear size L crushed into a small sphere of radius R << L in N-dimensional space. We investigate the low elastic energy states of 2-sheets…
Eric M. Kramer, Thomas A. WittenSep 4, 1996
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Quantum Interference Phenomena in the Local Polarization Dynamics of Mesoscopic Systems: An NMR Observation
It was predicted that local spin polarization in a ring of five dipolar coupled spins should present a particular fingerprint of quantum interferences reflecting both the discrete and finite nature…
Horacio M. Pastawski, Gonzalo Usaj, Patricia R. LevsteinSep 3, 1996
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Critical Fluctuations in Topologically Massive Superconductors
We consider a topologically massive Ginzburg-Landau model of superconductivity. In the context of a mean field calculation, we show that there is an increase in the critical temperature driven by the…
A. P. C. Malbouisson, F. S. Nogueira, N. F. SvaiterSep 3, 1996
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Quantum Transition between an Antiferromagnetic Mott Insulator and dx2 - y2 Superconductor in Two Dimensions
We consider a Hubbard model on a square lattice with an additional interaction, W, which depends upon the square of a near-neighbor hopping. At half-filling and a constant value of the Hubbard…
F. F. Assaad, M. Imada, D. J. ScalapinoSep 3, 1996
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