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Persistent URL http://purl.org/net/epubs/work/50817
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Record Id 50817
Title Zener double exchange from local valence fluctuations in magnetite
Contributors
Abstract Magnetite (Fe3O4) is a mixed valent system where electronic conductivity occurs on the B site (octahedral) iron sublattice of the spinel structure. Below TV=123 K, a metal-insulator transition occurs which is argued to arise from the charge ordering of 2+ and 3+ iron valences on the B sites (Verwey transition). Inelastic neutron scattering measurements show that optical spin waves propagating on the B site sublattice (~80 meV) are shifted upwards in energy above TV due to the occurrence of B-B ferromagnetic double exchange in the mixed valent phase. The double exchange interaction affects only spin waves of 5 symmetry, not all modes, indicating that valence fluctuations are slow and the double exchange is constrained by short-range electron correlations above TV.
Organisation ISIS , ISIS-MAPS , STFC
Keywords Physics
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Language English (EN)
Type Details URI(s) Local file(s) Year
Journal Article Phys Rev Lett 99 (2007): 246401. doi:10.1103/PhysRevLett.99.246401 PhysRevLett_99_246401.pdf 2007