Abstract
Magnetite, the ferrospinel Fe3+[Fe2+Fe3+]04, is ferrimagnetic with atomic moments characteristic of localized, high- spin configurations with orbital-momentum quenched. An unactivated electrical conductivity of low electron mobility u leaves open the question whether the mobile d electrons on the octahedral sites are itinerant (u = ei/m*) or polarons (u = eDo/kT) having no activation energy for a jump between molecular orbitals of Fe-Fe pairs. Below a sharp Verwey transition at about 120K, the mobile charges are ordered; but the structural evidence is still inadequate to clarify whether this is a complex ordering of small polarons or the stabilization of a charge-density wave.
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Goodenough, J.B. (1980). The Verwey Transition Revisited. In: Brown, D.B. (eds) Mixed-Valence Compounds. NATO Advanced Study Institutes Series, vol 58. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-9076-0_14
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DOI: https://doi.org/10.1007/978-94-009-9076-0_14
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