Quantum spin glasses with cubic anisotropy

Z. Doman´ski, T. K. Kopec´, and F. Pa´zma´ndi
Phys. Rev. B 49, 3378 – Published 1 February 1994
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Abstract

An infinite-range quantum Ising spin glass with cubic anisotropy (K) is studied using the imaginary-time representation with the n-replica approach and the thermofield dynamic method. Mean-field-theory phase diagrams in the temperature-anisotropy plane (T,K) for quantum spins S ranging from 2 to 9/2 are presented. For integer-spin values and large cubic anisotropy (positive or negative, depending on S) a condensation into a nonmagnetic spin state occurs, accompanied by the destruction of the spin-glass order as indicated by the finite critical value Kc(T=0). For half-integer S and sufficiently low temperature the spin-glass phase persists for arbitrary K.

  • Received 6 October 1993

DOI:https://doi.org/10.1103/PhysRevB.49.3378

©1994 American Physical Society

Authors & Affiliations

Z. Doman´ski, T. K. Kopec´, and F. Pa´zma´ndi

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

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Issue

Vol. 49, Iss. 5 — 1 February 1994

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