Journal ArticleDOI
Molecular polarons and valence fluctuations in Fe3O4
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TLDR
In this paper, the authors proposed a molecular polaron model to describe the properties of valance fluctuations in Fe3O4 above the Verwey transition temperature, where the lifetime of a polaron is assumed to be long enough to induce a strain field around it.Abstract:
We propose a ‘molecular polaron’ model which describes the properties of valance fluctuations in Fe3O4 above the Verwey transition temperature. The molecular polaron is dynamically coupled cluster, or a vibronic state associated with two electrons in four-site molecular orbitals coupled to local vibrational modes with T2g symmetry. The lifetime of a molecular polaron is assumed to be long enough to induce a strain field around it. That is, each molecular polaron is considered to be ‘dressed’ by an instantaneous strain field. Based on this model, neutron Huang scattering due to the strain field around independent molecular polarons has been calculated. The observed patterns of neutron diffuse scatteringagree quite well with the calculated patterns, which seems to ensure the validity of the proposed model.read more
Citations
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Journal ArticleDOI
The Verwey transition - a topical review
TL;DR: The story of the Verwey transition in magnetite over a period of about 90 years, from its discovery up to the present, can be subdivided into three eras as mentioned in this paper.
Journal ArticleDOI
Electron states, magnetism, and the Verwey transition in magnetite
Ze Zhang,Sashi Satpathy +1 more
TL;DR: Using density-functional calculations, a three-band spinless model Hamiltonian is suggested for the description of the Verwey transition using a Stoner model as well as from calculations within the framework of the local-spin-density approximation to the density- functional theory.
Book ChapterDOI
Chapter 3 Progress in spinel ferrite research
TL;DR: In this paper, the progress in spinel ferrite research is discussed and a large number of oxides with a metal-oxygen ratio of 0.75 as composition is known to crystallize into the spinel structure.
Journal ArticleDOI
Magnetite: a search for the half-metallic state
TL;DR: Both the spin-resolved photoelectron spectroscopy experiments and the DFT density of states give evidence for a half-metal to metal transition: the measured spin polarization and theoretical value are significantly lower than the -100% predicted by local spin density approximation calculations for the bulk magnetite crystal.
Journal ArticleDOI
High-resolution photoemission spectroscopy of the Verwey transition in Fe3O4.
TL;DR: In this article, the first-order Verwey transition in single-crystal Fe 3D was studied using high-resolution temperature-dependent (100--300 K) photoemission spectroscopy.
References
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Journal ArticleDOI
Metal-insulator transitions in Ti 4 O 7 single crystals: Crystal characterization, specific heat, and electron paramagnetic resonance
Journal ArticleDOI
Study of the 123-K phase transition of magnetite by critical neutron scattering
Y. Fujii,Gen Shirane,Y. Yamada +2 more
Related Papers (5)
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