Thermodynamics of the quantum easy-plane antiferromagnet on the triangular lattice

Details Thermodynamics of the quantum easy-plane antiferromagnet on the triangular lattice Thermodynamics of the quantum easy-plane antiferromagnet on the triangular lattice

1999-02-01

arxiv.org/abs/cond-mat/9902024v1

Phys. Rev. B 60, 7299 (1999)

Physics

Condensed Matter

Statistical Mechanics

4 pages,3 postscript figures

Scientific paper

10.1103/PhysRevB.60.7299

The classical XXZ triangular-lattice antiferromagnet (TAF) shows both an Ising and a BKT transition, related to the chirality and the in-plane spin components, respectively. In this paper the quantum effects on the thermodynamic quantities are evaluated by means of the pure-quantum self-consistent harmonic approximation (PQSCHA), that allows one to deal with any spin value through classical MC simulations. We report the internal energy, the specific heat, and the in-plane correlation length of the quantum XX0 TAF, for S=1/2, 1, 5/2. The quantum transition temperatures turn out to be smaller the smaller the spin, and agree with the few available theoretical and numerical estimates.

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