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Physics Letters A, Vol. 269 (1) (2000) pp. 55-61
© 2000 Elsevier Science B.V. All rights reserved.
PII: S0375-9601(00)00223-1

Phase transitions of classical XXZ model with easy-plane anisotropy on a two-layer triangular lattice

Yi Wang and Tsuyoshi Horiguchi * tsuyoshi@statp.is.tohoku.ac.jp

Department of Computer and Mathematical Sciences, Graduate School of Information Sciences, Tohoku University 04, Aramaki-aza-aoba, Aoba-ku, Sendai 980-8579, Japan

Received 9 December 1999; received in revised form 13 March 2000; accepted 14 March 2000

Communicated by L.J. Sham

Abstract

We investigate phase transitions of a classical XXZ model with easy-plane anisotropy, on a two-layer triangular lattice with ferromagnetic and antiferromagnetic layers by using Monte Carlo simulations. It turns out that the chirality shows a very steep increase as temperature increases in a temperature range; the value of a critical exponent for this change is estimated.

PACS: 75.10.Hk; 05.50+q; 75.30K; 75.40.c

Keywords: Classical Heisenberg model; Frustration; Two-layer; Chirality

*Corresponding author. Tel.: +81-22-217-5842; fax: +81-22-217-5851.

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