Magnetization Relaxation and Collective Spin Excitations in Correlated Double--Exchange Ferromagnets

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dc.creatorKapetanakis, M. D.
dc.creatorPerakis, I. E.
dc.date2008-06-05
dc.date2008-10-29
dc.date.accessioned2026-07-07T10:13:32Z
dc.date.available2026-07-07T10:13:32Z
dc.descriptionWe study spin relaxation and dynamics of collective spin excitations in correlated double--exchange ferromagnets. For this, we introduce an expansion of the Green's functions equations of motion that treats non--perturbativerly all correlations between a given number of spin and charge excitations and becomes exact within a sub--space of states. Our method treats relaxation beyond Fermi's Golden Rule while recovering previous variational results for the spin--wave dispersion. We find that the momentum dependence of the spin--wave dephasing rate changes qualitatively due to the on--site Coulomb interaction, in a way that resembles experiment, and depends on its interplay with the magnetic exchange interaction and itinerant spin lifetime. We show that the collective spin relaxation and its dependence on the carrier concentration depends sensitively on three--body correlations between a spin excitation and a Fermi sea electron and hole. The above spin dynamics can be controlled via the itinerant carrier population.
dc.description13 pages, 10 figures, published in Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/0806.0938
dc.identifierhttp://arxiv.org/abs/0806.0938
dc.identifierPhysical Review B 78, 155110 (2008)
dc.identifierdoi:10.1103/PhysRevB.78.155110
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/172565
dc.subjectStrongly Correlated Electrons
dc.titleMagnetization Relaxation and Collective Spin Excitations in Correlated Double--Exchange Ferromagnets
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