Phase transition properties of the spin-1 Blume-Emery-Griffiths model with random transverse crystal field |
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Authors: | X. Qian S.L. Yan |
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Affiliation: | a Department of Physics, Soochow University, Suzhou 215006, PR Chinab Jiangsu Key Laboratory of Film Materials, Soochow University, Suzhou 215006, PR Chinac CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, PR China |
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Abstract: | Phase transition properties of a spin-1 Blume-Emery-Griffiths model (BEGM) with random transverse crystal field is studied by the effective field theory for a simple cubic lattice. In T−Dx space, we obtain the phase diagrams with the ratio α between the biquadratic interaction and the exchange interaction as well as a tunable parameter l of the transverse crystal field. The tricritical point (TCP) appears at α<0, which undergoes a crossover from positive to negative direction of the transverse crystal field when l<0. The TCP cannot be observed for α>0. The maximum critical temperature increases with the increase of α. The position of the peak value tends to the drift of negative or positive direction for a different magnitude or an imperfect (±) transverse crystal field distribution. In T−α space, the range of ordered phase is magnified when the ratio is changed from α<0 to α>0. The random transverse crystal field obviously affects the TCP. |
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Keywords: | A. Blume-Emery-Griffiths model C. Random transverse crystal field D. Phase transition property |
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