Ferromagnetism and Transport in the Double-Exchange Model, with and without Phonons; Application to the Manganites

Simple item page
dc.creatorEdwards, D. M.
dc.creatorGreen, A. C. M.
dc.date2001-09-14
dc.date2001-09-19
dc.date.accessioned2026-07-07T02:42:43Z
dc.date.available2026-07-07T02:42:43Z
dc.descriptionAn introduction is given to the many-body coherent potential approximation (CPA) for the double-exchange (DE) model and the Holstein-DE model, the latter including coupling of the electrons to local phonons as well as to local spins. It is shown how the method can treat the local spins and phonons quantum-mechanically and how it is equivalent to dynamical mean field theory in the classical limit. In the Holstein-DE model a full discussion is given of the cross-over from weak electron-phonon coupling through intermediate coupling, where small-polaron bands begin to appear, to strong coupling where some results similar to those of standard small-polaron theory are recovered. The theory is applied to ferromagnetic manganites with a full discussion of magnetic, transport and spectroscopic data. It is found that many manganites are in the critical regime on the verge of small-polaron formation, which explains their sensitivity to parameters such as applied magnetic field and pressure.
dc.description26 pages, 14 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0109266
dc.identifierhttp://arxiv.org/abs/cond-mat/0109266
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/18257
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.titleFerromagnetism and Transport in the Double-Exchange Model, with and without Phonons; Application to the Manganites
dc.typetext

Files

Collections

arXiv