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Anisotropic Heisenberg Ferromagnet with Biquadratic Exchange Interaction
Author(s) -
Iwashita T.,
Satou R.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199906)213:2<471::aid-pssb471>3.0.co;2-o
Subject(s) - condensed matter physics , ferromagnetism , heisenberg model , exchange interaction , curie temperature , magnetization , physics , anisotropy , ising model , quantum mechanics , magnetic field
For the anisotropic Heisenberg ferromagnet of S = 1 with the bilinear exchange interaction J and the biquadratic exchange interaction J 1 , the magnetization 〈 S z 〉 and the Curie temperature T C have been caluculated by making use of the pair model approximation. It is pointed out that the biquadratic exchange interaction J 1 gives different effects on the magnetization 〈 S z 〉 of the Heisenberg, the anisotropic Heisenberg and the Ising ferromagnets especially in the negative region of J 1 ≤ — J . Furthermore, the dependence of the Curie temperature T C on the biquadratic exchange interaction J 1 turns out to show an anormalous behavior for the Heisenberg ferromagnet in the range of J 1 ≤ —2.35 J .