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dc.contributor.authorMcQueeney, R. J.eng
dc.contributor.authorYethiraj, M.eng
dc.contributor.authorMontfrooij, Woutereng
dc.contributor.authorGardner, J. S.eng
dc.contributor.authorMetcalf, P.eng
dc.contributor.authorHonig, Jurgen M.eng
dc.date.issued2006eng
dc.description.abstractInelastic neutron scattering results on magnetite (Fe3O4) show a large splitting in the acoustic spin wave branch, producing a 7 meV gap midway to the Brillouin zone boundary at q=(0,0,1∕2) and ℏω=43 meV. The splitting occurs below the Verwey transition temperature, where a metal-insulator transition occurs simultaneously with a structural transformation, supposedly caused by the charge ordering on the iron sublattice. The wavevector (0,0,1∕2) corresponds to the superlattice peak in the low symmetry structure. The dependence of the magnetic superexchange on changes in the crystal structure and ionic configurations that occur below the Verwey transition affect the spin wave dispersion. To better understand the origin of the observed splitting, several Heisenberg models intended to reproduce the pair-wise variation of the magnetic superexchange arising from both small crystalline distortions and charge ordering were studied. None of the models studied predicts the observed splitting, whose origin may arise from charge-density wave formation or magnetoelastic coupling.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. W-7405-ENG-82, Oak Ridge National Laboratory, which is managed by UT-Batelle LLC, under Contract No. DE-AC00OR22725 and Brookhaven National Laboratory under Contract DEAC02-98CH10886.eng
dc.identifier.citationPhys. Rev. B 73, 174409 (2006) [16 pages]eng
dc.identifier.issn1098-0121eng
dc.identifier.urihttp://hdl.handle.net/10355/7207eng
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://prb.aps.org/pdf/PRB/v73/i17/e174409eng
dc.subjectexchange and superexchange interactionseng
dc.subjectmetal-insulator transitions and other electronic transitionseng
dc.subjectneutron inelastic scatteringeng
dc.subject.lcshMagnetite crystalseng
dc.subject.lcshSpin waveseng
dc.titleInvestigation of the presence of charge order in magnetite by measurement of the spin wave spectrumeng
dc.typeArticleeng


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