Quantum Monte Carlo study of spin 12 ± Jz chains

Wataru Yokozeki, Kazuo Shiiki and Mitsuru Fukuchi

Physica A: Statistical Mechanics and its Applications, 1996, vol. 223, issue 1, 214-226

Abstract: Disorder of anisotropy is introduced into spin 12 quantum XXZ chains. This model, which is refered as the spin 12 ± Jz chain, is studied by the quantum Monte Carlo method. It displays the critical phenomena of the x−y phase, though the critical exponents γ, η and ν must be corrected. However, the antiferromagnetic alternating spin chains show no critical phenomena. It is found that the susceptibility along the z axis and averaged zz pair spin correlation functions of alternating spin chains show obviously different behavior from those of ±Jz chains.

Date: 1996
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:223:y:1996:i:1:p:214-226

DOI: 10.1016/0378-4371(95)00290-1

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