期刊
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
卷 522, 期 -, 页码 18-32出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physa.2019.01.123
关键词
Random anisotropy; Blume-Capel model; Phase diagram
资金
- CNPq, Brazil
- FAPEMAT, Brazil
- CAPES, Brazil
We have studied the effects of the random transverse single-ion anisotropy in the phase diagram and in the thermodynamic properties of the spin-1 Blume-Capel quantum model, which has been used the approach the mean-field theory based on the Bogoliubov inequality for the Gibbs free energy. The phase diagrams were obtained in the temperature tau = k(B)T/zJ versus single-ion anisotropy delta(x) = D-x/zJ plane for several values of delta(y) = D-y/zJ, p and q. The results show that there is a tricritical behavior only in the range of delta(y) given by -0.048 <= delta(y) < 0.5. This behavior is shown again by the curves of the magnetization m as a function of temperature tau with corresponding values of delta(y), p and q. (C) 2019 Elsevier B.V. All rights reserved.
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