Effective-field-theory analysis of the three-dimensional random-field Ising model on isometric lattices

AKINCI Ü., YÜKSEL Y., POLAT H.

PHYSICAL REVIEW E, vol.83, no.6, 2011 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 83 Issue: 6
  • Publication Date: 2011
  • Doi Number: 10.1103/physreve.83.061103
  • Journal Name: PHYSICAL REVIEW E
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Dokuz Eylül University Affiliated: Yes

Abstract

An Ising model with quenched random magnetic fields is examined for single-Gaussian, bimodal, and double-Gaussian random-field distributions by introducing an effective-field approximation that takes into account the correlations between different spins that emerge when expanding the identities. Random-field distribution shape dependencies of the phase diagrams and magnetization curves are investigated for simple cubic, body-centered-cubic, and face-centered-cubic lattices. The conditions for the occurrence of reentrant behavior and tricritical points on the system are also discussed in detail.