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dc.contributor.authorDiallo, S. O.
dc.contributor.authorAntropov, V. P.
dc.contributor.authorPerring, T.G.
dc.contributor.authorBroholm, C.
dc.contributor.authorPulikkotil, J. J.
dc.contributor.authorNi, N.
dc.contributor.authorBud'ko, S.L.
dc.contributor.authorCanfield, P.C.
dc.contributor.authorKreyssig, A.
dc.contributor.authorGoldman, A. I.
dc.contributor.authorMcQueeney, R. J.
dc.date.accessioned2009-12-29T18:21:44Z
dc.date.available2009-12-29T18:21:44Z
dc.date.issued2009-05-08
dc.identifier.citationPhysical Review Letters 8 May 2009, vol.102, no.18, 187206 (4 ppen_US
dc.identifier.urihttp://jhir.library.jhu.edu/handle/1774.2/33734
dc.description.abstractNeutron scattering measurements of the magnetic excitations in single crystals of antiferromagnetic CaFe2As2 reveal steeply dispersive and well-defined spin waves up to an energy of ~100 meV. Magnetic excitations above 100 meV and up to the maximum energy of 200 meV are however broader in energy and momentum than the experimental resolution. While the low energy modes can be fit to a Heisenberg model, the total spectrum cannot be described as arising from excitations of a local moment system. Ab initio calculations of the dynamic magnetic susceptibility suggest that the high energy behavior is dominated by the damping of spin waves by particle-hole excitations.en_US
dc.language.isoen_USen_US
dc.publisherAmerican Physical Societyen_US
dc.subjectneutron diffractionen_US
dc.subjectmagnetic susceptibilityen_US
dc.subjectmagnetic momentsen_US
dc.subjectiron compoundsen_US
dc.subjectitinerant magnetic excitations;en_US
dc.subjectneutron scatteringen_US
dc.subjectsingle crystalsen_US
dc.subjectspin wavesen_US
dc.subjectHeisenberg modelen_US
dc.subjectlocal moment systemen_US
dc.subjectcalcium compoundsen_US
dc.subjectband model of magnetismen_US
dc.subjectantiferromagnetic materialsen_US
dc.subjectab initio calculationsen_US
dc.subjectdynamic magnetic susceptibilityen_US
dc.subjectparticle-hole excitationsen_US
dc.subjectCaFe2As2en_US
dc.titleItinerant magnetic excitations in antiferromagnetic CaFe2As2en_US
dc.typeArticleen_US


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