Thermal boson expansion for the Heisenberg ferromagnet

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

Physica A: Statistical Mechanics and its Applications, 1986, vol. 137, issue 1, 196-208

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.

Date: 1986
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:137:y:1986:i:1:p:196-208

DOI: 10.1016/0378-4371(86)90071-3

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