Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/1116
Title: Giant Magnetoresistance Phenomenon in Manganates
Authors: Rao, C N R
Keywords: charge ordering
giant magnetoresistance
magnetoresistance
manganates
rare earth manganates
Colossal Magnetoresistance
Room-Temperature
Thin-Films
Lamno3
Phase
La1-Xcaxmno3
La1-Xsrxmno3
Resistivity
Behavior
Oxide
Issue Date: Dec-1996
Publisher: WILEY-VCH Verlag GmbH
Citation: Chemistry - A European Journal 2(12), 1499–1504 (1996)
Abstract: The discovery of giant magnetoresistance (GMR) in rare earth manganates of the general formula Ln(1-x)A(x)MnO(3) (Ln = rare earth, A = divalent cation) has aroused much interest not only because of its technological implications, but also due to the fascinating features and mechanism of the phenomemon in these oxides. GMR is observed in these manganates when they become ferromagnetic and transform from an insulating state to a metallic state close to the Curie temperature. The essential features of magnetoresistance in the manganates can be understood on the basis of the double-exchange mechanism, but this is too simplistic to account for all the observed data. The most curious property of the manganates relates to the high resistivity exhibited in the so-called metallic state. Charge ordering competes with the double-exchange interaction responsible for ferromagnetism and GMR in these materials. The charge-ordered (charge-crystal) insulating state in the rare earth manganates can be melted into a metallic and ferromagnetic charge-liquid state by applying a magnetic field, thus providing a unique case of charge and spin separation in solids. The observation of GMR in Tl2Mn2O7 shows that there can be causes other than double-exchange for the phenomenon.
Description: Restricted Access
URI: http://hdl.handle.net/10572/1116
Other Identifiers: 0947-6539
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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