Random Crystal Field in a Mixed Spin S =  1/2 and S =  3/2 Ising Model by Renormalization Group Theory

  • S. Zouhair
  • M. Monkade
  • M. Bourass
  • A. El Antari
  • M. El Bouziani
  • M. Madani
  • A. Alrajhi
Original Paper
  • 16 Downloads

Abstract

In this work, we study the Ising model with mixed spins S =  1/2 and S =  3/2 on the hypercubic lattice and the random crystal field at the sublattice with S = 3/2 described by a two peaks law. To achieve this, we use an approximation of position space renormalization group (PSRG) namely Migdal-Kadanoff in which we use both the free energy derivative and the flow in the parameter space of the Hamiltonian. For all values of the random probability, the critical behavior is determined via the critical exponents at the second-order fixed points while at low temperatures; the discontinuities of the of the free energy derivative provide the positions of the first-order transitions. The introduction of a minimal amount of disorder causes a change in the phase diagram showing the relevance of disorder for d = 2 and d = 3. The second-order transition remains always with the same critical exponents as those of the pure model, and a new first-order transition appears at very low temperature. Also, a comparison with other similar works is given.

Keywords

Mixed spins Phase diagrams Renormalization Free energy Random anisotropy 

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Authors and Affiliations

  1. 1.Equipe de Physique Théorique, Laboratoire L.P.M.C., Département de Physique, Faculté des SciencesUniversité Chouaib DoukkaliEl JadidaMorocco
  2. 2.Département de Physique-ChimieCRMEFMeknèsMorocco
  3. 3.Department of Information Technologies, Faculty of Education and Applied SciencesHodeidah UniversityRaymahYemen

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