Competition between axial and cubic anisotropies in Heisenberg spin glasses

Zbigniew Doman-acuteski
Phys. Rev. B 55, 5827 – Published 1 March 1997
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Abstract

An infinite-range quantum Heisenberg spin glass with uniaxial (D) and cubic (K) anisotropies is studied using the thermo-field-dynamic method. Mean-field theory phase diagrams in the temperature-anisotropy plane (T,D) for quantum spins S=2 and S=5/2 are presented for different values of K. Generally, for integer spin values and large anisotropy D a condensation into a nonmagnetic spin state occurs, accompanied by the destruction of the spin-glass order as indicated by the finite critical value Dc(T=0). For half-integer S and sufficiently low temperature, the spin-glass phase persists for arbitrary D and K. In both cases the presence of a cubic term induces complicated crossovers from longitudinal to transverse freezing of spins.

  • Received 14 June 1996

DOI:https://doi.org/10.1103/PhysRevB.55.5827

©1997 American Physical Society

Authors & Affiliations

Zbigniew Doman-acuteski

  • Institute of Theoretical Physics, University of Lausanne, CH-1015 Lausanne, Switzerland

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Issue

Vol. 55, Iss. 9 — 1 March 1997

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