New Correlated Model of Colossal Magnetoresistive Manganese Oxides

Abstract

A new minimal model is constructed for the doped manganese oxides which exhibit colossal magnetoresistance (CMR), involving broad spin-majority conduction band as well as nearly localised spin-minority electron states. A simple mean field analysis yields a temperature-dependent hybridised band structure with suppressed carrier weight at the Fermi level. Spin stiffness is complex, indicating unusually strong spin wave damping. Experimental and theoretical investigations are needed to further verify the relevance of the proposed model.

LaTeX-RevTeX, 5 pages, 2 figures, Phys. Rev. Lett., in press; minor corrections

References in corpus (6)

• Theory of Insulator Metal Transition and Colossal Magnetoresistance in Doped Manganites
• Modelling colossal magnetoresistance manganites
• Magnons in Ferromagnetic Metallic Manganites
• Dynamical mean field theory for transition temperature and optics of CMR manganites
• Effects of the On-Site Coulomb Repulsion in Double Exchange Magnets
• Two-Fluid Behaviour at the Origin of the Resistivity Peak in Doped Manganites

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• Spin wave damping arising from phase coexistence below $T_c$ in colossal magnetoresistive La${}_{0.7}$Ca${}_{0.3}$MnO${}_3$
• Enhanced ferromagnetism from electron-electron interactions in double exchange type models