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

Abstract

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.

arXiv comment14 pages, Latex, 21 encapsulated postscript figures, to be published in Phys. Rev. B

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• Critical behavior of the Coulomb-glass model in the zero-disorder limit: Ising universality in a system with long-range interactions
• Critical behaviour in two-dimensional Coulomb Glass at zero temperature
• Numerical observation of a glassy phase in the three-dimensional Coulomb glass
• Finite temperature phase transition in the two-dimensional Coulomb glass at low disorders
• Charge ordering in the three-dimensional Coulomb glass at finite temperatures and low disorders
• Critical behavior of the specific heat in Ti-Si amorphous alloys at the metal-insulator transition