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Spin‐one Ising model with biquadratic exchange interaction within functional integration method
Author(s) -
Vatamaniuk O.,
Rudavskii Yu.
Publication year - 1996
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221970127
Subject(s) - tricritical point , condensed matter physics , phase diagram , ising model , ferromagnetism , exchange interaction , bilinear interpolation , spin (aerodynamics) , physics , point (geometry) , critical point (mathematics) , phase (matter) , phase transition , quantum mechanics , mathematics , thermodynamics , mathematical analysis , statistics , geometry
A spin‐one Ising model with biquadratic exchange interaction is investigated within a functional integration approach. The phase diagram is analyzed by means of Landau's free energy expansion. The dependence of the features of the system on the ratio of bilinear to biquadratic exchange interaction constants is discussed. In the random phase approximation, expressions for phase transition temperatures and the tricritical point for the ferromagnetic transition are obtained.