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Condensed Matter papers — page 237

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The Structure of Barium in the hcp Phase Under High Pressure
Recent experimental results on two hcp phases of barium under high pressure show interesting variation of the lattice parameters. They are here interpreted in terms of electronic structure…
W. -S. Zeng, O. Jepsen, V. HeineAug 26, 1996
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Spin liquid in 3D Kondo lattice. High temperature regime
The mechanism explaining the key role of AFM correlations in formation of the heavy fermion state is offered. It is shown that in the case of (T*-TN)/TN << 1 the critical spin fluctuations…
K. A. Kikoin, M. N. Kiselev, A. S. MishchenkoAug 26, 1996
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Screening effects in superconductors
The partition function of the Hubbard model with local attraction and long range Coulomb repulsion between electrons is written as a functional integral with an action A involving a pairing field…
Massimiliano Capezzali, Daniel Ariosa, Hans BeckAug 26, 1996
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Spin and charge gaps in the one-dimensional Kondo-lattice model with Coulomb interaction between conduction electrons
The density-matrix renormalization-group method is applied to the one-dimensional Kondo-lattice model with the Coulomb interaction between the conduction electrons. The spin and charge gaps are…
N. Shibata, T. Nishino, K. Ueda et al.Aug 26, 1996
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Spectral form factor in a random matrix theory
In the theory of disordered systems the spectral form factor S(τ), the Fourier transform of the two-level correlation function with respect to the difference of energies, is linear for τ<τc and…
E. Brézin, S. HikamiAug 26, 1996
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Form-factors computation of Friedel oscillations in Luttinger liquids
We show how to analytically determine for g≤ 1/2 the "Friedel oscillations" of charge density by a single impurity in a 1D Luttinger liquid of spinless electrons.
F. Lesage, H. SaleurAug 25, 1996
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New Universality Class at the Superconductor--Insulator Transition
We study dynamic properties of thin films near the superconductor - insulator transition. We formulate the problem in a phase representation. The key new feature of our model is the assumption of a…
Karl-Heinz Wagenblast, Anne van Otterlo, Gerd Schön et al.Aug 24, 1996
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Variational state based on the Bethe ansatz solution and a correlated singlet liquid state in the one-dimensional t-J model
The one-dimensional t-J model is investigated by the variational Monte Carlo method. A variational wave function based on the Bethe ansatz solution is newly proposed, where the spin-charge separation…
Kenji Kobayashi, Chikaomi Ohe, Kaoru IguchiAug 24, 1996
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Fragmentation phase transition in atomic clusters I --- Microcanonical thermodynamics
Here we first develop the thermodynamics of microcanonical phase transitions of first and second order in systems which are thermodynamically stable in the sense of van Hove. We show how both kinds…
D. H. E. Gross, M. E. Madjet, O. SchapiroAug 23, 1996
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Bulk Versus Edge in the Quantum Hall Effect
The manifestation of the bulk quantum Hall effect on edge is the chiral anomaly. The chiral anomaly is the underlying principle of the ``edge approach'' of quantum Hall effect. In that…
Y. -C. Kao, D. -H. LeeAug 23, 1996
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Spin Splitting and Weak Localization in (110) GaAs/AlGaAs Quantum Wells
We investigate experimentally and theoretically the spin-orbit effects on the weak localization in a (110) GaAs 2-dimensional electron gas (2DEG). We analyze the role of two different terms in the…
T. Hassenkam, S. Pedersen, K. Baklanov et al.Aug 23, 1996
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NMR in copper-Oxide Metals
The anomalous part of the NMR relaxation rate of coppernuclei in the normal state of copper-oxide metals is calculated using the orbital magnetic parts of the fluctuations derived in a recent theory…
C. M. VarmaAug 23, 1996
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Cooperative Chiral Order in Copolymers of Chiral and Achiral Units
Polyisocyanates can be synthesized with chiral and achiral pendant groups distributed randomly along the chains. The overall chiral order, measured by optical activity, is strongly cooperative and…
J. V. Selinger, R. L. B. SelingerAug 23, 1996
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Mott Transition in Degenerate Hubbard Models: Application to Doped Fullerenes
The Mott-Hubbard transition is studied for a Hubbard model with orbital degeneracy N, using a diffusion Monte-Carlo method. Based on general arguments, we conjecture that the Mott-Hubbard transition…
Olle Gunnarsson, Erik Koch, Richard M. MartinAug 23, 1996
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Frustration induced Raman scattering in CuGeO3
We present experimental data for the Raman intensity in the spin-Peierls compound CuGeO3 and theoretical calculations from a one-dimensional frustrated spin model. The theory is based on (a) exact…
V. N. Muthukumar, Claudius Gros, Wolfgang Wenzel et al.Aug 23, 1996
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Is there a Phase Transition to the Flux Lattice State?
The sharp drops in the resistance and magnetization which are usually attributed to a phase transition from the vortex liquid state to a crystal state are explained instead as a crossover between…
M. A. MooreAug 23, 1996
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RKKY interaction and Kondo screening cloud for correlated electrons
The RKKY law and the Kondo screening cloud around a magnetic impurity are investigated for correlated electrons in 1D (Luttinger liquid). We find slow algebraic distance dependences, with a crossover…
Reinhold Egger, Herbert SchoellerAug 23, 1996
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Phase transition in a spring-block model of surface fracture
A simple and robust spring-block model obeying threshold dynamics is introduced to study surface fracture of an overlayer subject to stress induced by adhesion to a substrate. We find a novel phase…
Kwan-tai Leung, Joergen Vitting AndersenAug 23, 1996
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Electric field scaling at a B=0 metal-insulator transition in two dimensions
The non-linear (electric field-dependent) resistivity of the 2D electron system in silicon exhibits scaling as a function of electric field and electron density in both the metallic and insulating…
S. V. Kravchenko, D. Simonian, M. P. Sarachik et al.Aug 22, 1996
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Spin ladders with nonmagnetic impurities
We investigate antiferromagnetic spin ladders with nonmagnetic impurities by variational and numerical (Lanczos and DMRG) methods. The interaction between the two unpaired spins opposite to the…
H. -J. Mikeska, U. Neugebauer, U. SchollwoeckAug 22, 1996
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The Upper Critical Dimension of the KPZ Equation
The strong-coupling regime of Kardar-Parisi-Zhang surface growth driven by short-ranged noise has an upper critical dimension d> less or equal to four (where the dynamic exponent z takes the value z…
Michael Lassig, Harald KinzelbachAug 22, 1996
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Supercurrent in a mesoscopic proximity wire
Recent experiments on the proximity induced supercurrent in mesoscopic normal wires revealed a surprising temperature dependence. They suggest clean-limit behavior although the wires are strongly…
Frank K. Wilhelm, Andrei D. Zaikin, Gerd SchoenAug 22, 1996
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Chaotic Scattering with Resonance Enhancement
The passage of light or of electrons through a disordered medium is modified in the presence of resonances. We describe a simple model for this problem, and present first results.
B. Elattari, V. Kagalovsky, H. A. WeidenmuellerAug 22, 1996
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Continuum Monte Carlo Simulation at Constant Pressure of Stiff Chain Molecules at Surfaces
Continuum Monte-Carlo simulations at constant pressure are performed on short chain molecules at surfaces. The rodlike chains, consisting of seven effective monomers, are attached at one end to a…
R. Hilfer, F. M. HaasAug 22, 1996
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Ground State Entropy and the q=3 Potts Antiferromagnet on the Honeycomb Lattice
We study the q-state Potts antiferromagnet with q=3 on the honeycomb lattice. Using an analytic argument together with a Monte Carlo simulation, we conclude that this model is disordered for all…
Robert Shrock, Shan-Ho TsaiAug 21, 1996
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