Critical properties of the mixed spin-1 and spin-12 anisotropic Heisenberg model in the Oguchi approximation

A. Bobák, V. Pokorný and J. Dely

Physica A: Statistical Mechanics and its Applications, 2009, vol. 388, issue 11, 2157-2167

Abstract: The effects of both an exchange anisotropy and a single-ion anisotropy on the phase diagram of the mixed spin-1 and spin-12 Heisenberg model are investigated by the use of an Oguchi approximation. Particular emphasis is given to the simple cubic lattice with coordination number z=6 for which the phase diagram and magnetizations are determined numerically. Besides second-order transitions, lines of first-order transitions terminating either at a tricritical point or an isolated critical point, are determined. The origin and nature of the new ordered phase in the quantum mixed-spin system at the low temperature region is also discussed.

Keywords: Mixed-spin Heisenberg model; Single-ion anisotropy; Phase diagram; Multicritical points (search for similar items in EconPapers)
Date: 2009
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:388:y:2009:i:11:p:2157-2167

DOI: 10.1016/j.physa.2009.02.017

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