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)
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
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.
Received: 09 September 2005
Revised: 17 June 2006
Accepted manuscript online:
PACS:
75.30.Kz
(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
(Magnetization curves, hysteresis, Barkhausen and related effects)
Fund: 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).
Cite this article:
Yan Shi-Lei(晏世雷) and Zhu Hai-Xia(朱海霞) Critical behaviours and magnetic properties of three-dimensional bond and anisotropy dilution Blume--Capel model in the presence of an applied field 2006 Chinese Physics 15 3026
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