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Structure, electron-transport properties, and giant magnetoresistance of hole-doped LaMnO3 systems

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dc.contributor.author Mahendiran, R
dc.contributor.author Tiwary, S K
dc.contributor.author Raychaudhuri, A K
dc.contributor.author Ramakrishnan, T V
dc.contributor.author Mahesh, R
dc.contributor.author Rangavittal, N
dc.contributor.author Rao, C N R
dc.date.accessioned 2012-11-16T10:28:09Z
dc.date.available 2012-11-16T10:28:09Z
dc.date.issued 1996-02-01
dc.identifier 0163-1829 en_US
dc.identifier.citation Physical Review B 53(6), 3348-3358 (1996) en_US
dc.identifier.uri https://libjncir.jncasr.ac.in/xmlui/10572/992
dc.description Restricted Access en_US
dc.description.abstract Results of a detailed investigation of the structure and electron-transport properties of La(1-x)A(x)MnO(3) (A=Ca, Sr) over a wide range of compositions are presented along with those of parent LaMnO3 containing different percentages of Mn4+. The electrical resistivity (rho) and magnetoresistance (MR) of polycrystalline pellets have been measured in the 4.2-400 K range in magnetic fields up to 6 T and the Seebeck coefficient (S) from 100 to 400 K. The electrical measurements were supplemented by ac susceptibility and magnetization measurements. MR is large and negative over a substantial range of compositions and peaks around temperatures close to the ferromagnetic transition temperatures (T-c). An insulator to metal-like transition occurs near the T-c and the temperature dependence of rho below T-c is related to the magnetization although rho in the metallic state is generally much larger than the Mott's maximum metallic resistivity. The occurrence of giant magnetoresistance is linked to the presence of an optimal proportion of Mn4+ ions and is found in the rhombohedral and the cubic structures where the Mn-O distance is less than 1.97 Angstrom and the Mn-O-Mn angle is 170 degrees+/-10 degrees. The field dependence of MR shows the presence of two distinct regimes. The thermopower S shows a positive peak in the composition range at a temperature where MR also peaks; S becomes more negative with increase in Mn4+. en_US
dc.description.uri http://dx.doi.org/10.1103/PhysRevB.53.3348 en_US
dc.language.iso en en_US
dc.publisher American Physical Society en_US
dc.rights © 1996 The American Physical Society en_US
dc.subject electron-transport properties en_US
dc.subject La12xAxMnO3 en_US
dc.subject giant magnetoresistance en_US
dc.subject electrical resistivity en_US
dc.subject Seebeck coefficient en_US
dc.title Structure, electron-transport properties, and giant magnetoresistance of hole-doped LaMnO3 systems en_US
dc.type Article en_US


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