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Ferromagnetic Transition Assuming a Nonlinear Volume Exchange Interaction
Author(s) -
Bärner K.,
Zavadskii E. A.,
Suminov D.Yu.
Publication year - 1999
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/(sici)1521-3951(199908)214:2<411::aid-pssb411>3.0.co;2-8
Subject(s) - nonlinear system , ferromagnetism , volume (thermodynamics) , curie temperature , condensed matter physics , statistical physics , term (time) , physics , mathematics , materials science , thermodynamics , quantum mechanics
According to theoretical concepts, the dependence of the exchange integral on the interatomic distance J ab ( r ) has an extremum. But the dependence of the Curie temperature on volume is usually assumed linear, which excludes the description of the behaviour near the extremum. In the current contribution we therefore introduce a nonlinear term into J ab ( r ). This can lead to supermagnetostriction.