Field induced tricritical behavior in the S=1/2 quasi one-dimensional frustrated Ising antiferromagnet

2007/05/14 by E. Meloche, Meloche, E., M. L. Plumer +1
Physics and Astronomy · #FOS: Physical sciences #Opinion Dynamics and Social Influence #Quantum many-body systems #Strongly Correlated Electrons (cond-mat.str-el) #Theoretical and Computational Physics #cond-mat.str-el

paper · pdf · doi:10.48550/arxiv.0705.1935

4 pages, 3 figures

arxiv created 2007/05/14 · openalex publication_date 2007/05/14 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The results of extensive histogram cluster heat-bath Monte Carlo simulations on the critical behavior of the quasi-one dimensional Ising antiferromagnet on a stacked triangular lattice are presented. A small applied field is shown to induce a crossover from XY universality to mean-field tricritical behavior. Experimental estimates of critical exponents suggest that these two types of phase transitions are observed in S=1 CsNiCl₃ and S=1/2 CsCoBr₃, respectively. The present results demonstrate that this difference can be explained by an unusual staggered magnetic field arising from quantum exchange mixing previously proposed to account for spin excitations in S=1/2 quasi-one-dimensional Ising antiferromagnets.

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