Effect of Increasing Disorder on the Critical Behavior of a Coulomb System

Details Effect of Increasing Disorder on the Critical Behavior of a Coulomb System Effect of Increasing Disorder on the Critical Behavior of a Coulomb System

2004-08-06

arxiv.org/abs/cond-mat/0408154v2

Physics

Condensed Matter

Disordered Systems and Neural Networks

14 pages, Latex, 21 encapsulated postscript figures, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.70.214203

We have performed a Monte Carlo study of a classical three dimensional Coulomb system in which we systematically increase the positional disorder. We start from a completely ordered system and gradually transition to a Coulomb glass. The phase transition as a function of temperature is second order for all values of disorder. We use finite size scaling to determine the transition temperature T_C and the critical exponent nu. We find that T_C decreases and that nu increases with increasing disorder. We also observe changes in the specific heat, the single particle density of states, and the staggered occupation as a function of disorder and temperature.

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