A Green Function Theory of an Anisotropic Antiferromagnet
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概要
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A formalism to obtain double-time Green functions is developed for a magnetic spin system with two sublattices in the presence of the one-ion type uniaxial anisotropy. Using identities for spin operators a set of equations for Green functions is solved formally for general spins. Explicit expressions of them are given for an antiferromagnet with S=1 and effects of the anisotropy to magnetic properties of this system are investigated in detail. The results thus obtained may be applicable to an entire range of magnitude of the anisotropy constant. Effects of the anisotropy to the critical temperature and excitation spectrum of the system at low temperatures are discussed in comparison with other theories. A brief comment on temperature variation of the second moment of EPR line due to the anisotropy is also given.
- 社団法人日本物理学会の論文
- 1973-04-05
著者
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TANAKA Motoyuki
Department of Internal Medicine Kure Kyosai Hospital
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KONDO Yoshiro
Department of Applied Biology, Kyoto Institute of Technology
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