Two Ferromagnetic States in Magnetoresistive Manganites - First Order Transition Driven by Orbitals -

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dc.creatorMaekawa, S.
dc.creatorIshihara, S.
dc.creatorOkamoto, S.
dc.date1998-12-27
dc.date.accessioned2026-07-07T03:12:30Z
dc.date.available2026-07-07T03:12:30Z
dc.descriptionA systematic study of the electronic structure in perovskite manganites is presented. The effective Hamiltonian is derived by taking into account the degeneracy of $e_g$ orbitals and strong electron correlation in Mn ions. The spin and orbital orderings are examined as functions of carrier concentration in the mean-field approximation applied to the effective Hamiltonian. We obtain the first order phase transition between ferromagnetic metallic and ferromagnetic insulating states in the lightly doped region. The transition is accompanied with the orbital order-disorder one which is directly observed in the anomalous X-ray scattering experiments. The present investigation shows a novel role of the orbital degree of freedom on metal-insulator transition in manganites.
dc.description15 pages, 7 ps-figures, to appear in the proceedings of a Conference on Physics of Manganites, held July 26-29 1998 at Michigan (Plenum Press)
dc.identifierhttps://arxiv.org/abs/cond-mat/9812405
dc.identifierhttp://arxiv.org/abs/cond-mat/9812405
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/28932
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.titleTwo Ferromagnetic States in Magnetoresistive Manganites - First Order Transition Driven by Orbitals -
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