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dc.contributor.authorRao, C N R-
dc.contributor.authorCheetham, A K-
dc.contributor.authorMahesh, R-
dc.identifier.citationChemistry Of Materials 8(10), 2421-2432 (1996)en_US
dc.descriptionReview. Restricted Access.en_US
dc.description.abstractGiant magnetoresistance (GMR), which was until recently confined to magnetic layered and granular materials, as well as doped magnetic semiconductors, occurs in manganate perovskites of the general formula Ln(1-x)A(x)MnO(3) (Ln = rare earth; A = divalent ion). These manganates are ferromagnetic at or above a certain value of x (or Mn4+ content) and become metallic at temperatures below the curie temperature, Tc. GMR is generally a maximum close to Tc or the insulator-metal (I-M) transition temperature, Tim. The Tc and %MR are markedly affected by the size of the A site cation, 〈rA〉, thereby affording a useful electronic phase diagram when Tc or Tim is plotted against 〈rA〉. We discuss GMR and related properties of manganates in polycrystalline, thin-film, and single-crystal forms and point out certain commonalities and correlations. We also examine some unusual features in the electron-transport properties of manganates, in particular charge-ordering effects. Charge ordering is crucially dependent on 〈rA〉 or the e(g) band width, and the charge-ordered insulating state transforms to a metallic ferromagnetic state on the application of a magnetic field.en_US
dc.publisherAmerican Chemical Societyen_US
dc.rights© 1996 American Chemical Societyen_US
dc.subjectDouble-Exchange Ferromagneten_US
dc.subjectColossal Magnetoresistanceen_US
dc.subject(La1-Xcax)Mno3 Filmsen_US
dc.subjectDefect Chemistryen_US
dc.titleGiant Magnetoresistance and Related Properties of Rare-Earth Manganates and Other Oxide Systemsen_US
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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