High-energy photoemission on Fe3O4: Small polaron physics and the Verwey transition

Abstract

We have studied the electronic structure and charge ordering (Verwey) transition of magnetite (Fe3O4) by soft x-ray photoemission. Due to the enhanced probing depth and the use of different surface preparations we are able to distinguish surface and volume effects in the spectra. The pseudogap behavior of the intrinsic spectra and its temperature dependence give evidence for the existence of strongly bound small polarons consistent with both dc and optical conductivity. Together with other recent structural and theoretical results our findings support a picture in which the Verwey transition contains elements of a cooperative Jahn-Teller effect, stabilized by local Coulomb interaction.

References in corpus (4)

• Long Range Charge Ordering in Magnetite Below the Verwey Transition
• Infrared and Raman studies of the Verwey transition in magnetite
• Charge and orbital order in Fe_3O_4
• Prominent quasi-particle peak in the photoemission spectrum of the metallic phase of V_2O_3

Cited by in corpus (33)

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