Theory of the verwey transition in the mixed valence compound Eu 3 S 4 | Zendy

Ihle D. | Zendy; Lorenz B. | Zendy

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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.

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