ar X iv : c on d - m at / 9 70 32 48 v 1 2 8 M ar 1 99 7 Low - Temperature Features of Nano - Particle Dynamics

ar X iv : c on d - m at / 9 70 30 28 v 1 3 M ar 1 99 7 In - plane optical response of Bi 2 Sr 2 CuO 6

We report on infrared reflectivity measurements of the ab-plane response of superconducting Bi2Sr2CuO6 single crystals. The frequency dependent conductivity has a maximum near 500 cm at room temperature, which shifts to lower frequency and merges with a Drude peak below 100 K. We attribute the unusual behavior of the mid-infrared conductivity to low frequency transitions between electronic band...

ar X iv : c on d - m at / 9 70 10 47 v 1 8 J an 1 99 7 Low Dimensional Ordering on a Lattice Model Fabio

A simple d-dimensional lattice model is proposed, incorporating some degree of frustration and thus capable of describing some aspects of molecular orientation in covalently bound molecular solids. For d = 2 the model is shown to be equivalent to the standard two-dimensional Ising model, while for d > 2 it describes a peculiar transition from an isotropic high temperature phase to a low-dimensi...

ar X iv : c on d - m at / 9 70 80 30 v 1 [ co nd - m at . s up r - co n ] 5 A ug 1 99 7 1

ar X iv : c on d - m at / 9 70 32 09 v 1 2 4 M ar 1 99 7 Equilibrium and nonequilibrium applications of lattice - gas models in electrochemistry

Per Arne Rikvold, Gregory Brown, M. A. Novotny, Andrzej Wieckowski a Center for Materials Research and Technology and Department of Physics, Florida State University, Tallahassee, FL 32306-3016, USA b Supercomputer Computations Research Institute, Florida State University, Tallahassee, FL 32306-4052, USA c Department of Fundamental Sciences, College of Integrated Human Studies, Kyoto University...

ar X iv : c on d - m at / 9 60 30 88 v 1 1 2 M ar 1 99 6 Finite temperature mobility of a particle coupled to a fermion environment

We study numerically the finite temperature and frequency mobility of a particle coupled by a local interaction to a system of spinless fermions in one dimension. We find that when the model is integrable (particle mass equal to the mass of fermions) the static mobility diverges. Further, an enhanced mobility is observed over a finite parameter range away from the integrable point. We present a...