Abstract
Electrical resistivity and magnetoresistive behaviour of bismuth-substituted lanthanum manganites La0.4Bi0.1Ca0.5−x Sr x MnO3 (x = 0.1 and 0.2) were systematically studied by varying the temperature from 2 to 300 K and the magnetic field up to 12 T. The samples were found to crystallize in rhombohedral structure and their morphology shows near-spherical nanosize crystallites. Charge ordering was observed in both the samples under zero field conditions and corresponding transition temperature T CO was found to decrease with the increase of x. Resistivity measurements with magnetic field also showed suppression of magnetoresistivity (MR) with the increase of x and the maximum MR was found to be 98 and 93% for x = 0.1 and 0.2, respectively, at 10 T. In the high-temperature domain, the electronic transport was observed to be dominated by the variable range hopping mechanism for both the samples, whereas in the low-temperature domain the electrical conduction of x = 0.1 sample was observed to be contributed by various other electron scattering mechanisms.
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SUBHASHINI, P., MUNIRATHINAM, B., KRISHNAIAH, M. et al. Electronic transport and magnetoresistivity of La0.4Bi0.1Ca0.5−x Sr x MnO3 (x = 0.1 and 0.2). Bull Mater Sci 38, 1449–1455 (2015). https://doi.org/10.1007/s12034-015-1036-3
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DOI: https://doi.org/10.1007/s12034-015-1036-3