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    Green function theory of anisotropic Heisenberg Ferromagnet with biquadratic exchange

    The effects of biquadratic exchange interaction and the uniaxial anisotropy on the curie temperature of the Heisenberg Ferromagnet with spin-one has been studied. Green function technique with random phase app...

    M. Tiwari, R. N. Srivastava in Zeitschrift für Physik B Condensed Matter (1982)