中国物理B ›› 2004, Vol. 13 ›› Issue (12): 2147-2152.doi: 10.1088/1009-1963/13/12/030

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Magnetic properties of mixed Ising system with random field

张起1, 魏国柱2, 梁雅秋3, 邱巍3, 藏树良4   

  1. (1)College of Sciences, Northeastern University, Shenyang 110006, China; (2)College of Sciences, Northeastern University, Shenyang 110006, China; International Center for Material Physics, Chinese Academy of Sciences, Shengyang 110015, China; (3)Department of Physics, Liaoning University, Shengyang 110036, China; (4)School of Chemical Science & Engineering, Liaoning University, Shengyang 110036, China
  • 收稿日期:2004-01-14 修回日期:2004-07-12 出版日期:2004-12-17 发布日期:2005-03-17
  • 基金资助:
    Project supported by the Foundation of National 211 Engineering Program.

Magnetic properties of mixed Ising system with random field

Liang Ya-Qiu (梁雅秋)a, Wei Guo-Zhu (魏国柱)bc, Zhang Qi (张起)b, Qiu Wei (邱巍)a, Zang Shu-Liang (藏树良)d   

  1. a Department of Physics, Liaoning University, Shengyang 110036, China; b College of Sciences, Northeastern University, Shenyang 110006, China; c International Center for Material Physics, Chinese Academy of Sciences, Shengyang 110015, China; d School of Chemical Science & Engineering, Liaoning University, Shengyang 110036, China
  • Received:2004-01-14 Revised:2004-07-12 Online:2004-12-17 Published:2005-03-17
  • Supported by:
    Project supported by the Foundation of National 211 Engineering Program.

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摘要： A spin-1/2 and spin-3/2 mixed Ising system in a random field is studied by the use of effective-field theory with correlations. The phase diagrams and thermal behaviours of magnetizations are investigated numerically for the honeycomb lattice (z=3) and square lattice (z=4) respectively. The tricritical behaviours for both honeycomb and square lattices, as well as the reentrant behaviour for the square lattice are found.

关键词: mixed spins, random field, phase diagram, magnetizations

Abstract: A spin-1/2 and spin-3/2 mixed Ising system in a random field is studied by the use of effective-field theory with correlations. The phase diagrams and thermal behaviours of magnetizations are investigated numerically for the honeycomb lattice (z=3) and square lattice (z=4) respectively. The tricritical behaviours for both honeycomb and square lattices, as well as the reentrant behaviour for the square lattice are found.

Key words: mixed spins, random field, phase diagram, magnetizations

中图分类号:  (Classical spin models)

  • 75.10.Hk
75.10.Dg (Crystal-field theory and spin Hamiltonians) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 75.40.-s (Critical-point effects, specific heats, short-range order) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))