Zener double exchange from local valence fluctuations in magnetite

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dc.contributor.authorMcQueeney, RJen_AU
dc.contributor.authorYethiraj, Men_AU
dc.contributor.authorChang, Sen_AU
dc.contributor.authorMontfrooij, Wen_AU
dc.contributor.authorPerring, TGen_AU
dc.contributor.authorHonig, JMen_AU
dc.contributor.authorMetcalf, Pen_AU
dc.date.accessioned2008-04-28T05:28:39Zen_AU
dc.date.accessioned2010-04-30T05:02:57Zen_AU
dc.date.available2008-04-28T05:28:39Zen_AU
dc.date.available2010-04-30T05:02:57Zen_AU
dc.date.issued2007-12-14en_AU
dc.date.statistics2007-12en_AU
dc.description.abstractMagnetite (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 (similar to 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 Δ5 symmetry, not all modes, indicating that valence fluctuations are slow and the double exchange is constrained by short-range electron correlations above Tv. © 2007, American Physical Societyen_AU
dc.identifier.articlenumber246401en_AU
dc.identifier.citationMcQueeney, R. J., Yethiraj, M., Chang, S., Montfrooij, W., Perring, T. G., Honig, J. M., & Metcalf, P. (2007). Zener double exchange from local valence fluctuations in magnetite. Physical Review Letters, 99(24), 246401. doi:10.1103/PhysRevLett.99.246401en_AU
dc.identifier.govdoc1188en_AU
dc.identifier.issn0031-9007en_AU
dc.identifier.issue24en_AU
dc.identifier.journaltitlePhysical Review Lettersen_AU
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevLett.99.246401en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1136en_AU
dc.identifier.volume99en_AU
dc.language.isoenen_AU
dc.publisherAmerican Physical Societyen_AU
dc.subjectTemperature rangeen_AU
dc.subjectMagnetiteen_AU
dc.subjectElectric conductivityen_AU
dc.subjectIronen_AU
dc.subjectInelastic scatteringen_AU
dc.subjectSpin wavesen_AU
dc.subjectValenceen_AU
dc.subjectFluctuationsen_AU
dc.titleZener double exchange from local valence fluctuations in magnetiteen_AU
dc.typeJournal Articleen_AU
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