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On thermodynamics of spontaneous metamagnetism
Author(s) -
Tuszyński J. A.,
Cofta H.
Publication year - 1982
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.2221140207
Subject(s) - metamagnetism , thermodynamics , phenomenology (philosophy) , condensed matter physics , physics , lattice vibration , internal energy , vibration , phenomenological model , materials science , magnetic field , magnetization , quantum mechanics , philosophy , epistemology , phonon
A general phenomenology of the Heisenberg spontaneous metamagnet is developed on thermodynamical basis. Analysis of the power expanded free energy of an ambigious magnetoelastic spin system reveals the crucial role of temperature terms in inducing the spontaneous metamagnetic transition. The temperature term results from the influence of the lattice vibrations on the exchange parameter. The neglecting of such a vibration effect is identified as the source o serious discrepancies involved in all existing exchange‐inversion theories.