Phase Diagram of Random Field Spin-S Ising Model with a Transverse Field |
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Authors: | Yu-Qiang MA Chang-De GONG |
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Institution: | 1. Department of Physics, Nanjing University, Nanjing 210008, China;
2. CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, China |
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Abstract: | Random field spin-S Ising model with a transverse field has been studied by making use of the pair approximation with the discretized path-integral representation, and an analytical expression of second-order phase transition is derived for all the symmetric probability distributions of (longitudinal) random fields. The phase diagrams at T = 0 are obtained, and the conditions for existence of tricritical points are examined for an arbitrary number of nearest-neighbor spins. |
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