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Mechanism of the Verwey Transition in Magnetite

✍ Scribed by Piekarz, Przemysław; Parlinski, Krzysztof; Oleś, Andrzej M.

Book ID
120501238
Publisher
The American Physical Society
Year
2006
Tongue
English
Weight
232 KB
Volume
97
Category
Article
ISSN
0031-9007

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✦ Synopsis

By combining ab initio results for the electronic structure and phonon spectrum with the group theory, we establish the origin of the Verwey transition in Fe 3 O 4 . Two primary order parameters with X 3 and 5 symmetries are identified. They induce the phase transformation from the high-temperature cubic to the low-temperature monoclinic structure. The on-site Coulomb interaction U between 3d electrons at Fe ions plays a crucial role in this transition -it amplifies the coupling of phonons to conduction electrons and thus opens a gap at the Fermi energy.

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