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Low-energy coherent Stoner-like excitations in CaFe2As2

TitleLow-energy coherent Stoner-like excitations in CaFe2As2
Publication TypeJournal Article
Year of Publication2011
AuthorsKe LQ, van Schilfgaarde M, Pulikkotil JJ, Kotani TK, Antropov V
Journal TitlePhysical Review B
Volume83
Pages060404
Date Published02
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000287483400001
Keywordssuperconductivity
Abstract

Using linear-response density functional theory, magnetic excitations in the striped phase of CaFe2As2 are studied as a function of local-moment amplitude. We find a new kind of excitation: sharp resonances of Stoner-like (itinerant) excitations at energies comparable to the Neel temperature, originating largely from a narrow band of Fe d states near the Fermi level, and coexisting with more conventional (localized) spin waves. Both kinds of excitations can show multiple branches, highlighting the inadequacy of a description based on a localized spin model.
URL<Go to ISI>://000287483400001
DOI10.1103/PhysRevB.83.060404
Alternate JournalPhys. Rev. B