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Title: Effect of particle size on the giant magnetoresistance of La0.7Ca0.3MnO3
Authors: Mahesh, R
Mahendiran, R
Raychaudhuri, A K
Rao, C N R
Keywords: Lanthanum Compounds
Calcium Compounds
Manganese Oxides
Size Effect
Metal−Insulator Transformations
Temperature Dependence
Issue Date: 1996
Publisher: American Institute of Physics
Citation: Applied Physics Letters 68(16), 2291-2293 (1996)
Abstract: Effect of particle size on the electron transport and magnetic properties of La0.7Ca0.3MnO3 has been investigated. While the ferromagnetic Tc, low field magnetic susceptibility, and insulator-metal transition are markedly affected by the particle size, the maximum magnetoresistance exhibited by the samples near Tc is not sensitive to the particle size. However, the magnetoresistance at 4.2 K increases with decrease in particle size, suggesting a substantial contribution by the grain boundaries. Preliminary measurements on La0.7Sr0.3MnO3 samples of different particle sizes also corroborate the above conclusions. (C) 1996 American Institute of Physics.
Description: Restricted Access
Other Identifiers: 0003-6951
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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