Non--Heisenberg Spin Dynamics of Double-Exchange Ferromagnets with Coulomb Repulsion

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dc.creatorKapetanakis, M. D.
dc.creatorPerakis, I. E.
dc.date2007-03-05
dc.date2007-04-10
dc.date.accessioned2026-07-07T07:55:49Z
dc.date.available2026-07-07T07:55:49Z
dc.descriptionWith a variational three--body calculation we study the role of the interplay between the onsite Coulomb, Hund's rule, and superexchange interactions on the spinwave excitation spectrum of itinerant ferromagnets. We show that correlations between a Fermi sea electron--hole pair and a magnon result in a very pronounced zone boundary softening and strong deviations from the Heisenberg spinwave dispersion. We show that this spin dynamics depends sensitively on the Coulomb and exchange interactions and discuss its possible relevance to experiments in the manganites.
dc.description4 pages, 4 figures, published in Physical Review B as rapid communications
dc.identifierhttps://arxiv.org/abs/cond-mat/0703099
dc.identifierhttp://arxiv.org/abs/cond-mat/0703099
dc.identifierPHYSICAL REVIEW B 75, 140401(R) (2007)
dc.identifierdoi:10.1103/PhysRevB.75.140401
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/127096
dc.subjectStrongly Correlated Electrons
dc.titleNon--Heisenberg Spin Dynamics of Double-Exchange Ferromagnets with Coulomb Repulsion
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