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Theory of the verwey transition in the mixed valence compound Eu 3 S 4
Author(s) -
Ihle D.,
Lorenz B.
Publication year - 1983
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.2221160215
Subject(s) - polaron , condensed matter physics , charge ordering , coulomb , valence (chemistry) , ion , hartree , physics , electron , chemistry , charge (physics) , quantum mechanics
The Verwey transition in Eu 3 S 4 at T V = 186 K is explained on the basis of a model which takes into account the Coulomb interaction of the extra 4f electrons at the Eu 2+ ions and the formation of small polarons due to the interaction with phonons. This model is treated in the Hartree and cluster variation approximations. At T V a first‐order Verwey transition is obtained. The magnitude of the observed entropy change at T V is explained. Above T V the polarons are found to be considerably short‐range ordered.