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dc.contributor.authorSarathy, K Vijaya-
dc.contributor.authorVanitha, P V-
dc.contributor.authorSeshadri, Ram-
dc.contributor.authorCheetham, A K-
dc.contributor.authorRao, C N R-
dc.date.accessioned2012-03-14T09:32:18Z-
dc.date.available2012-03-14T09:32:18Z-
dc.date.issued2001-03-
dc.identifier0897-4756en_US
dc.identifier.citationChemistry Of Materials 13(3), 787-795 (2001)en_US
dc.identifier.urihttp://hdl.handle.net/10572/624-
dc.descriptionRestricted Accessen_US
dc.description.abstractProperties of the hole-doped Ln(1-x)A(x)MnO(3) (Ln = rare earth, A = alkaline earth, x < 0.5) are compared with those of the electron-doped compositions (x > 0.5). Charge ordering is the dominant interaction in the latter class of manganates unlike ferromagnetism and metallicity in the hole-doped materials. Properties of charge-ordered (CO) compositions in the hole- and electron-doped regimes, Pr0.64Ca0.36MnO3 and Pr0.36Ca0.64MnO3, differ markedly. Thus, the CO state in the hole-doped Pr0.64Ca0.36MnO3 is destroyed by magnetic fields and by substitution of Cr3+ or Ru4+ (3%) in the Mn site, while the CO state in the electron-doped Pr0.36Ca0.64MnO3 is essentially unaffected. It is not possible to induce long-range ferromagnetism in the electron-doped manganates by increasing the Mn-O-Mn angles up to 165 and 180 degrees as in La0.33Ca0.33Sr0.34MnO3; application of magnetic fields and Cr/Ru substitution (3%) do not result in long-range ferromagnetism and metallicity. Application of magnetic fields on the Cr/Ru-doped, electron-doped manganates also fails to induce metallicity. These unusual features of the electron-doped manganates suggest that the electronic structure of these materials is likely to be entirely different from that of the hole-doped ones, as verified by first-principles linearized muffin-tin orbital calculations.en_US
dc.description.urihttp://dx.doi.org/10.1021/cm000464wen_US
dc.language.isoenen_US
dc.publisherAmerican Chemical Societyen_US
dc.rights© 2001 American Chemical Societyen_US
dc.subjectColossal Magnetoresistanceen_US
dc.subjectGiant Magnetoresistanceen_US
dc.subjectManganitesen_US
dc.subjectTransitionen_US
dc.subjectPerovskiteen_US
dc.subjectLa1-Xcaxmno3en_US
dc.subjectTransporten_US
dc.subjectDisorderen_US
dc.subjectCrystalen_US
dc.subjectLamno3en_US
dc.titleElectron-Hole Asymmetry in the Rare-Earth Manganates: A Comparative Study of the Hole- and the Electron-Doped Materialsen_US
dc.typeArticleen_US
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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