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Critical temperature of an anisotropic ferromagnet in the presence of biquadratic exchange

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
20
Issue
12
Identifiers
DOI: 10.1016/0038-1098(76)90433-6
Disciplines
  • Physics

Abstract

Abstract A formulation, using the double time Green's function method, is presented for the anisotropic spin-one ferromagnetic system in the presence of biquadratic exchange and an expression is given for the critical temperature T c in terms of parameters associated with the uniaxial anisotropy (treated exactly) and the biquadratic interaction (only the longitudinal part, treated in RPA). The prediction that T c increases with the biquadratic exchange is found to be consistent with the recent calculation.

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