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Refined Model of Exchange Inversion in Spontaneous Metamagnetism
Author(s) -
Tuszyński J. A.,
Cofta H.
Publication year - 1981
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.2221080240
Subject(s) - metamagnetism , anharmonicity , condensed matter physics , lattice (music) , exchange interaction , physics , thermodynamics , ion , chemistry , magnetic field , ferromagnetism , quantum mechanics , magnetization , acoustics
The magnetic ions of an anharmonic crystal are assumed to interact through the Heisnberg exchange. In the temperature dependence of the exchange constants contributions from the lattice oscillations are included in addition to the usual exchange‐strictive term. The role of exchange‐striction in the metamagnetic transition is reexamined and a new eriterion for metamagnetism is formulated. An explanation for the lattice contraction of the Mn 3 GaC compound at the matamagnetic temperature is given and a paradox associated with previous theories is removed.