中国物理B ›› 2005, Vol. 14 ›› Issue (4): 821-825.doi: 10.1088/1009-1963/14/4/032

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Critical behaviour of coupled organic ferromagnet chains

郭继勇, 陈宇光, 陈鸿   

  1. Pohl Institute for Solid State Physics, Tongji University,Shanghai, 200092, China
  • 收稿日期:2004-10-09 修回日期:2004-11-13 出版日期:2005-04-20 发布日期:2005-03-28
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10304014,19904007 and 90103022)

Critical behaviour of coupled organic ferromagnet chains

Guo Ji-Yong (郭继勇), Chen Yu-Guang (陈宇光), Chen Hong (陈鸿)   

  1. Pohl Institute for Solid State Physics, Tongji University, Shanghai 200092, China
  • Received:2004-10-09 Revised:2004-11-13 Online:2005-04-20 Published:2005-03-28
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10304014,19904007 and 90103022)

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摘要： The interchain coupling in a model, which is most relevant to organic ferromagnets, is studied by a kind of mean field theory. A full phase diagram is given for this model. It is shown that the interchain coupling dramatically affects the ferromagnetic order in the ground state. When the interchain coupling reaches a critical value, the high-spin ground state disappears and the system may transit from ferromagnetic phase into Kondo-singlet phase.

Abstract: The interchain coupling in a model, which is most relevant to organic ferromagnets, is studied by a kind of mean field theory. A full phase diagram is given for this model. It is shown that the interchain coupling dramatically affects the ferromagnetic order in the ground state. When the interchain coupling reaches a critical value, the high-spin ground state disappears and the system may transit from ferromagnetic phase into Kondo-singlet phase.

Key words: interchain coupling, organic ferromagnets, dimerization

中图分类号:  (Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.))

  • 75.40.Cx
75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 75.50.Dd (Nonmetallic ferromagnetic materials) 75.30.Mb (Valence fluctuation, Kondo lattice, and heavy-fermion phenomena)