Effect of particle size on the giant magnetoresistance of $La_{0.7}Ca_{0.3}MnO_3$

Mahesh, R and Mahendiran, R and Raychaudhuri, AK and Rao, CNR (1996) Effect of particle size on the giant magnetoresistance of $La_{0.7}Ca_{0.3}MnO_3$. In: Applied Physics Letters, 68 (16). pp. 2291-2293.

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Abstract

Effect of particle size on the electron transport and magnetic properties of $La_{0.7}Ca_{0.3}MnO_3$ has been investigated. While the ferromagnetic $T_c$ , low field magnetic susceptibility, and insulator-metal transition are markedly affected by the particle size, the maximum magnetoresistance exhibited by the samples near $T_c$ 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 $La_{0.7}Sr_{0.3}MnO_3$ samples of different particle sizes also corroborate the above conclusions.

Item Type:	Journal Article
Publication:	Applied Physics Letters
Publisher:	American Institute of Physics
Additional Information:	Copyright of this article belongs to American Institute of Physics.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit Division of Physical & Mathematical Sciences > Physics
Date Deposited:	14 Mar 2007
Last Modified:	19 Sep 2010 04:35
URI:	http://eprints.iisc.ac.in/id/eprint/9733

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