Quantum anomalies in the phase diagrams of easy-plane antiferromagnets in a magnetic field
V. G. BorisenkoPhysicotechnical Institute for Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovYu. V. PereverzevPhysicotechnical Institute for Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kov
ABI
Abstract
We obtain the phase boundaries for easy-plane antiferromagnets with a single-ion anisotropy in a longitudinal magnetic field under a molecular field approximation for arbitrary values of the spin and the ratio of the anisotropy to the exchange. It is shown that for a finite spin S the phase diagram exhibits anomalies which disappear in the classical limit S → ∞.
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