Mixed Spin-2 and Spin-1/2 Anisotropic Heisenberg Model in the Oguchi Approximation

Mixed Spin-2 and Spin-1/2 Anisotropic Heisenberg Model in the Oguchi Approximation The exchange anisotropy and crystal field effects for the mixed spin-2 and spin-1/2 Heisenberg model are studied on a square lattice by using the Oguchi approximation. Thermal behaviors of the order-parameters, i.e., magnetizations and quadrupole moment, and free energy are investigated to obtain the possible phase diagrams of the model. Not only the stable solutions but also the possible unstable solutions of the model are illustrated on the phase diagrams. Ten topological phase diagrams are presented which is just enough to understand the critical behavior of the model. It is found that the model yields both second- and first-order transitions, in addition to the tricritical and isolated critical points. The existence of compensation temperatures are also searched and it is found that the model gives two compensations for given system parameters. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Superconductivity and Novel Magnetism Springer Journals

Mixed Spin-2 and Spin-1/2 Anisotropic Heisenberg Model in the Oguchi Approximation

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Publisher
Springer Journals
Copyright
Copyright © 2017 by Springer Science+Business Media New York
Subject
Physics; Strongly Correlated Systems, Superconductivity; Magnetism, Magnetic Materials; Condensed Matter Physics; Characterization and Evaluation of Materials
ISSN
1557-1939
eISSN
1557-1947
D.O.I.
10.1007/s10948-017-4079-4
Publisher site
See Article on Publisher Site

Abstract

The exchange anisotropy and crystal field effects for the mixed spin-2 and spin-1/2 Heisenberg model are studied on a square lattice by using the Oguchi approximation. Thermal behaviors of the order-parameters, i.e., magnetizations and quadrupole moment, and free energy are investigated to obtain the possible phase diagrams of the model. Not only the stable solutions but also the possible unstable solutions of the model are illustrated on the phase diagrams. Ten topological phase diagrams are presented which is just enough to understand the critical behavior of the model. It is found that the model yields both second- and first-order transitions, in addition to the tricritical and isolated critical points. The existence of compensation temperatures are also searched and it is found that the model gives two compensations for given system parameters.

Journal

Journal of Superconductivity and Novel MagnetismSpringer Journals

Published: Mar 29, 2017

References

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