Random field effects on the phase diagrams of spin-1/2 Ising model on a honeycomb lattice


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YÜKSEL Y., AKINCI Ü., POLAT H.

PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, vol.391, no.3, pp.415-422, 2012 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 391 Issue: 3
  • Publication Date: 2012
  • Doi Number: 10.1016/j.physa.2011.09.009
  • Journal Name: PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.415-422
  • Keywords: Effective field theory, Ferromagnetism, Phase diagrams, RFIM, LOWER CRITICAL DIMENSION, CRITICAL-BEHAVIOR, THERMODYNAMICAL PROPERTIES, TRICRITICAL BEHAVIOR, MAGNETIC-PROPERTIES, MONTE-CARLO, MEAN-FIELD, TRANSITION, SYSTEMS, POINTS
  • Dokuz Eylül University Affiliated: Yes

Abstract

The 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 dependence of the phase diagrams, magnetization and internal energy is investigated for a honeycomb lattice with a coordination number q = 3. The conditions for the occurrence of reentrant behavior and tricritical points on the system are also discussed in detail. (C) 2011 Elsevier B.V. All rights reserved.