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dc.contributor.authorMcQueeney, R. J.eng
dc.contributor.authorYethiraj, M.eng
dc.contributor.authorChang, S.eng
dc.contributor.authorMontfrooij, Woutereng
dc.contributor.authorPerring, T. G.eng
dc.contributor.authorHonig, Jurgen M.eng
dc.contributor.authorMetcalf, P.eng
dc.date.issued2008eng
dc.descriptionReceived 19 July 2007; published 10 December 2007; publisher error corrected 5 February 2008eng
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 (∼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.eng
dc.description.sponsorshipWork is supported by the U. S. Department of Energy Office of Science under the following contracts: Ames Laboratory under Contract No. DE-AC02-07CH11358, Oak Ridge National Laboratory, which is managed by UT-Batelle LLC, under Contract No. DEAC00OR22725.eng
dc.identifier.citationPhys. Rev. Lett. 99, 246401 (2007) [4 pages]eng
dc.identifier.issn0031-9007eng
dc.identifier.urihttp://hdl.handle.net/10355/7204eng
dc.languageEnglisheng
dc.publisherAmerican Physical Societyeng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. College of Arts and Sciences. Department of Physics and Astronomy. Physics and Astronomy publicationseng
dc.source.urihttp://prl.aps.org/pdf/PRL/v99/i24/e246401eng
dc.subjectmetal-insulator transitionseng
dc.subjectspin waveseng
dc.subjectexchange interactionseng
dc.subjectneutron inelastic scatteringeng
dc.subject.lcshMagnetiteeng
dc.subject.lcshNeutrons -- Scatteringeng
dc.subject.lcshElectron configurationeng
dc.subject.lcshValence fluctuationseng
dc.titleZener Double Exchange from Local Valence Fluctuations in Magnetiteeng
dc.typeArticleeng


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