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Disordered spin‐one Ising model with biquadratic exchange interaction within functional integration method
Author(s) -
Rudavskii Yu.,
Vatamaniuk O.,
Savenko V.
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.2221970222
Subject(s) - ising model , condensed matter physics , statistical physics , series (stratigraphy) , exchange interaction , spin (aerodynamics) , phase (matter) , physics , series expansion , energy functional , random phase approximation , energy (signal processing) , phase transition , ferromagnetism , quantum mechanics , thermodynamics , biology , paleontology
A disordered spin‐one Ising model with biquadratic exchange interaction is investigated within a functional integration approach. The free energy is presented in the form of a functional expansion in a series over the Fourier‐transformed density fluctuations. In random phase approximation expressions for phase transition temperatures are obtained. The structural disorder is simulated by means of hard core system structure factors.