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Magnetic-Field Induced First-Order Transition in the Frustrated XY Model on a Stacked Triangular Lattice

M. L. Plumer, A. Mailhot, A. Caillé

cond-matarXiv:cond-mat/9303001

Abstract

The results of extensive Monte Carlo simulations of magnetic-field induced transitions in the xy model on a stacked triangular lattice with antiferromagnetic intraplane and ferromagnetic interplane interactions are discussed. A low-field transition from the paramagnetic to a 3-state (Potts) phase is found to be very weakly first order with behavior suggesting tricriticality at zero field. In addition to clarifying some long-standing ambiguity concerning the nature of this Potts-like transition, the present work also serves to further our understanding of the critical behavior at TN, about which there has been much controversy.

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