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Thermodynamic properties of random transverse mixed Ising spin system with cryst al field

Zhang Ya-Nan Yan Shi-Lei

Thermodynamic properties of random transverse mixed Ising spin system with cryst al field

Zhang Ya-Nan, Yan Shi-Lei
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  • Received Date:  12 February 2003
  • Accepted Date:  13 March 2003
  • Published Online:  20 November 2003

Thermodynamic properties of random transverse mixed Ising spin system with cryst al field

  • 1. (1)苏州大学物理系,苏州 215006; (2)苏州大学物理系,苏州 215006;苏州大学薄膜材料江苏省重点实验室,苏州 215006

Abstract: Making use of the effective field theory (EFT) and a cutting approximation, in the framework of Ising model, we investigate the thermodynamic properties of a random transverse mixed spin system with a crystal field. Special emphasis is placed on the influence of crystal field, transverse field and random concentration on phase transitions of the system. Our studies find that a smaller crystal field cannot change the percolation threshold of the critical transverse field in the presence of a random transverse field, and that the reentrant phenomena shall appear in the range of random concentration concerned when the transverse field takes a larger value, where as the reentrant phenomena do not occur and when the transverse field takes a smaller value. These new thermodynamic properties have not been reported in previous works so far as we know. We give a series of pha se diagrams and discuss them in detail.

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