The Verwey Transition Revisited
DOI: 10.1007/978-94-009-9076-0_14
关键词: Activation energy 、 Condensed matter physics 、 Charge ordering 、 Materials science 、 Molecular orbital 、 Spin (physics) 、 Polaron 、 Electron 、 Electron mobility 、 Ferrimagnetism
摘要: Magnetite, the ferrospinel Fe3+[Fe2+Fe3+]04, is ferrimagnetic with atomic moments characteristic of localized, high- spin configurations orbital-momentum quenched. An unactivated electrical conductivity low electron mobility u leaves open question whether mobile d electrons on octahedral sites are itinerant (u = ei/m*) or polarons eDo/kT) having no activation energy for a jump between molecular orbitals Fe-Fe pairs. Below sharp Verwey transition at about 120K, charges ordered; but structural evidence still inadequate to clarify this complex ordering small stabilization charge-density wave.
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