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Application of the thermal boson expansion to the Heisenberg antiferromagnet MnF2

Authors: M. Brajczewska, C. Fiolhais and J. da ProvidĂȘncia

Ref.: Physica B 160, 357-364 (1990)

Abstract: We apply the thermal boson expansion which has been presented in refs. [1-3] to the Heisenberg isotropic antiferromagnet, submitted to an external field. Considering only spin waves with wave vectors up to a certain cut-off, the magnetization and the principal susceptibilities are calculated. The results with the experimental data on MnF2.