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Calculation of the Spin System Correlation Functions in the Frames of the Functional Integration Method. II. The Heisenberg Model
Author(s) -
Vakarchuk I. A.,
Matskevych P. A.
Publication year - 1992
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.2221700131
Subject(s) - heisenberg model , isotropy , correlation function (quantum field theory) , spin (aerodynamics) , function (biology) , condensed matter physics , order (exchange) , curie temperature , quantum , correlation , physics , mathematics , quantum mechanics , mathematical physics , statistical physics , thermodynamics , geometry , ferromagnetism , evolutionary biology , biology , dielectric , economics , finance
New equations for the correlation functions obtained in the frames of the functional integration method are applied to investigate the magnetic ordering in the Heisenberg isotropic quantum model. The Curie temperature of this model is calculated from the pole of the longitudinal Green function. Good agreement with known data is obtained in the crystalline case. It is shown that the magnetic order can be destroyed by the amorphization of the crystal.