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Prog. Theor. Phys. Vol. 48 No. 6 (1972) pp. 1815-1827

[ Full Text PDF : FREE ACCESS (964K) ]

A Green-Function Theory of an Anisotropic Ferromagnet

Motoyuki Tanaka and Yoshiro Kondo*

Department of Physics, Faculty of Science, Okayama University, Okayama
*Department of Physics, Kawasaki Medical College, Kurashiki, Okayama

(Received May 4, 1972)

Abstract:

A Green-function approach to investigate magnetic properties of the exchange-coupled system with the uniaxial anisotropy is presented for the case of a ferromagnet. The central procedure of the method is to treat the Green functions associated with the anisotropy energy adequately without decoupling and obtain a set of coupled equations to determine correlation functions and thermodynamic quantities. A method to terminate the chain of equations is proposed for the case of general spin S. The results thus obtained may be applicable to the whole range of intensity of the anisotropy constant. The theory is developed explicitly for the case of S = 1, then the correlation functions and the critical temperature in several limiting cases are compared with the results of other theories.


URL : http://ptp.ipap.jp/link?PTP/48/1815/
DOI : 10.1143/PTP.48.1815

[ Full Text PDF : FREE ACCESS (964K) ] Citation:

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Citing Article(s) :

  1. Progress of Theoretical Physics Vol. 50 No. 2 (1973) pp. 708-709 :
    On a Generating Function of Anisotropy Green Functions
    Yoshiro Kondo and Motoyuki Tanaka
  2. Progress of Theoretical Physics Vol. 50 No. 4 (1973) pp. 1422-1424 :
    Magnetic Properties of Uniaxial Ferromagnets
    Motoyuki Tanaka, Hidemi Kitaguchi and Yoshiro Kondo
  3. Progress of Theoretical Physics Vol. 56 No. 3 (1976) pp. 801-807 :
    Anisotropic Spin One Ferromagnet in Callen's Approximation
    Vijay Kumar and K. C. Sharma
  4. Progress of Theoretical Physics Vol. 57 No. 3 (1977) pp. 1112-1114 :
    Green Function Approaches to the Heisenberg Ferromagnet with Biquadratic Interactions
    Motoyuki Tanaka and Kazuhiro Takahashi
  5. Progress of Theoretical Physics Vol. 58 No. 2 (1977) pp. 452-466 :
    Longitudinal Correlation Function for an Anisotropic Ferromagnet
    Yoshiro Kondo and Motoyuki Tanaka

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