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Thermal boson expansion for the Heisenberg ferromagnet

Author

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  • Brajczewska, M.
  • Fiolhais, C.
  • Da Providência, J.

Abstract

A boson expansion, which takes into account fluctuations around a mean-field description at finite temperatures, is applied to the Heisenberg model of S=12 ferromagnet. The approach incorporates the T3/2-law for the magnetization at low temperatures and, without considering dynamical interactions, provides a better estimate of the critical temperature than the conventional energy renormalized magnon theory and the random-phase approximation.

Suggested Citation

  • Brajczewska, M. & Fiolhais, C. & Da Providência, J., 1986. "Thermal boson expansion for the Heisenberg ferromagnet," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 137(1), pages 196-208.
    • Handle: RePEc:eee:phsmap:v:137:y:1986:i:1:p:196-208
    DOI: 10.1016/0378-4371(86)90071-3
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    References listed on IDEAS

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    1. Fiolhais, C. & da Providência, J.Pinheiro & Urbano, J.N., 1979. "Ferromagnetism by the generator coordinate Method," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 99(1), pages 251-267.
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