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Phase Transitions in Spin‐One Ferromagnetic Systems
Author(s) -
Kumar V.,
Sharma K. C.
Publication year - 1977
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.2220820220
Subject(s) - condensed matter physics , ferromagnetism , bilinear interpolation , anisotropy , spin (aerodynamics) , paramagnetism , physics , phase transition , phase (matter) , exchange interaction , quantum mechanics , mathematics , thermodynamics , statistics
A theory is given for the spin‐one ferromagnetic system containing all the major interactions. The anisotropy term is evaluated exactly whereas the bilinear and the biquadratic exchange terms are evaluated in RPA. A closed form expression for the critical temperature T c at which the quadrupolar to paramagnetic phase transition occurs, is given. The variation of T c vs. the biquadratic exchange parameter is presented and is compared with the earlier results.