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Giant Magnetoresistance and Related Properties of Rare-Earth Manganates and Other Oxide Systems

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dc.contributor.author Rao, C N R
dc.contributor.author Cheetham, A K
dc.contributor.author Mahesh, R
dc.date.accessioned 2012-11-27T11:12:41Z
dc.date.available 2012-11-27T11:12:41Z
dc.date.issued 1996
dc.identifier 0897-4756 en_US
dc.identifier.citation Chemistry Of Materials 8(10), 2421-2432 (1996) en_US
dc.identifier.uri https://libjncir.jncasr.ac.in/xmlui/10572/1105
dc.description Review. Restricted Access. en_US
dc.description.abstract Giant 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.description.uri http://dx.doi.org/10.1021/cm960201v en_US
dc.language.iso en en_US
dc.publisher American Chemical Society en_US
dc.rights © 1996 American Chemical Society en_US
dc.subject Double-Exchange Ferromagnet en_US
dc.subject Thin-Films en_US
dc.subject Transport-Properties en_US
dc.subject Colossal Magnetoresistance en_US
dc.subject (La1-Xcax)Mno3 Films en_US
dc.subject Defect Chemistry en_US
dc.subject Room-Temperature en_US
dc.subject Single-Crystals en_US
dc.subject Magnetic-Field en_US
dc.subject La1-Xsrxmno3 en_US
dc.title Giant Magnetoresistance and Related Properties of Rare-Earth Manganates and Other Oxide Systems en_US
dc.type Article en_US


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