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VOLUME 94 | ISSUE 8 | PAGE 710
Quantum magnets with large single-ion easy-plane anisotropy in magnetic field
A. V. Sizanov*, A. V. Syromyatnikov*†
*Petersburg Nuclear Physics Institute, Gatchina, 188300 St. Petersburg, Russia
Department of Physics, St. Petersburg State University, 198504 St. Petersburg, Russia

We propose a theory describing low-temperature properties of magnets with integer spin and large single-ion easy-plane anisotropy D in magnetic field H directed parallel to the hard axis. Considering the exchange interaction between spins as a perturbation and using the bosonic spin representation proposed in our recent paper [1] we find thermal corrections to the elementary excitation spectrum, magnetization and specific heat in the vicinity of the quantum critical point (QCP) H=H_{c1}(0)\sim D in the first nonvanishing orders of the perturbation theory. An expression is found for the boundary of the paramagnetic phase Hc1(T) in the H-T-plane. The effective interaction between bosons is derived near the QCP. The proposed theory describes well experimental data obtained in  NiCl2- 4SC(NH2)2 (DTN).

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