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Magnetization of a chain-like antiferromagnet

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
22
Issue
4
Identifiers
DOI: 10.1016/0038-1098(77)90395-7
Disciplines
  • Physics

Abstract

Abstract The temperature dependence of sublattice magnetizations in a chain-like antiferromagnet is investigated by the spin-wave theory considering kinematical interaction and dynamical interaction. For the latter the biquadratic terms are treated in the mean field approximation. The theory for zero-point spin reduction by Herbert and Ishikawa and Oguchi is extended to finite temperatures following Thermo-Field Dynamics approach by Takahashi. Numerical calculations for KCuF 3 show that the kinematical interaction plays an important role for the spontaneous magnetization, and when the effect of dynamical interaction is taken into account, the results obtained come nearer to the experimental ones.

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