Phase Diagram and Tricritical Behavior of a Spin-2 Transverse Ising Model in a Random Field |
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| Authors: | LIANG Ya-Qiu WEI Guo-Zhu SONG Li-Li SONG Guo-Li ZANG Shu-Liang |
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| Institution: | Department of Physics, Liaoning University, Shenyang 110036, China;College of Sciences, Northeastern University, Shenyang 110006, China College of Sciences, Northeastern University, Shenyang 110006, China;International Center for Material Physics, the Chinese Academy of Sciences, Shenyang 110016, China Department of Physics, Liaoning University, Shenyang 110036, China Machinery Research Institute of Liaoning Province, Shenyang 110032, China Department of Chemistry, Liaoning University, Shenyang 110036, China |
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| Abstract: | The phase diagrams of a spin-2 transverse Ising model with a random field on honeycomb, square, and simple-cubic lattices, respectively, are investigated within the framework of an effective-field theory with correlations.We find the behavior of the tricritical point and the reentrant phenomenon for the system with any coordination number z, when the applied random field is bimodal. The behavior of the tricritical point is also examined as a function of applied transverse field. The reentrant phenomenon comes from the competition between the transverse field and the random field. |
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| Keywords: | transverse Ising model random field phase diagram |
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