中国物理B ›› 2006, Vol. 15 ›› Issue (12): 3026-3032.doi: 10.1088/1009-1963/15/12/042

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Critical behaviours and magnetic properties of three-dimensional bond and anisotropy dilution Blume--Capel model in the presence of an applied field

朱海霞1, 晏世雷2   

  1. (1)Department of Physics, Suzhou University, Suzhou 215006, China;Department of Physics, Yancheng Normal College, Yancheng 224000, China; (2)Department of Physics, Suzhou University, Suzhou 215006, China;Jiangsu Key Laboratory of Thin Films, Suzhou University, Suzhou 215006, China
  • 收稿日期:2005-09-09 修回日期:2006-06-17 出版日期:2006-12-20 发布日期:2006-12-20
  • 基金资助:
    Project supported by the Education Bureau Key Natural Science Foundation of Jiangsu Province (Grant No 03KJA140117) and by the Open Foundation of Jiangsu Key Laboratory of Thin Film (Grant No K2022).

Critical behaviours and magnetic properties of three-dimensional bond and anisotropy dilution Blume--Capel model in the presence of an applied field

Yan Shi-Lei(晏世雷)a)b)† and Zhu Hai-Xia(朱海霞)a)c)   

  1. a Department of Physics, Suzhou University, Suzhou 215006, Chinab Jiangsu Key Laboratory of Thin Films, Suzhou University, Suzhou 215006, China; c Department of Physics, Yancheng Normal College, Yancheng 224000, China
  • Received:2005-09-09 Revised:2006-06-17 Online:2006-12-20 Published:2006-12-20
  • Supported by:
    Project supported by the Education Bureau Key Natural Science Foundation of Jiangsu Province (Grant No 03KJA140117) and by the Open Foundation of Jiangsu Key Laboratory of Thin Film (Grant No K2022).

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摘要： This paper studies the critical behaviours and magnetic properties of three-dimensional bond and anisotropy dilution Blume--Capel model (BCM) in the presence of an applied field within the effective field theory. The trajectory of tricritical point, reentrant transitions and degenerate patterns of anisotropy are obtained both for the bond and the anisotropy dilutions. The global phase diagrams demonstrate unusually reentrant phenomena. The temperature dependences of magnetization curves undergo remarkable spin glass behaviour at low temperatures, and transform from ferromagnetism to paramagnetism at high temperature in applied fields. Temperature dependence of magnetic susceptibility curve is in qualitative agreement with experimental result.

关键词: critical behaviours and magnetic properties, Blume--Capel model, bond and anisotropy dilutions, applied field

Abstract: This paper studies the critical behaviours and magnetic properties of three-dimensional bond and anisotropy dilution Blume--Capel model (BCM) in the presence of an applied field within the effective field theory. The trajectory of tricritical point, reentrant transitions and degenerate patterns of anisotropy are obtained both for the bond and the anisotropy dilutions. The global phase diagrams demonstrate unusually reentrant phenomena. The temperature dependences of magnetization curves undergo remarkable spin glass behaviour at low temperatures, and transform from ferromagnetism to paramagnetism at high temperature in applied fields. Temperature dependence of magnetic susceptibility curve is in qualitative agreement with experimental result.

Key words: critical behaviours and magnetic properties, Blume--Capel model, bond and anisotropy dilutions, applied field

中图分类号:  (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))

  • 75.30.Kz
75.10.-b (General theory and models of magnetic ordering) 75.30.Cr (Saturation moments and magnetic susceptibilities) 75.30.Gw (Magnetic anisotropy) 75.40.-s (Critical-point effects, specific heats, short-range order) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)