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# Giant Magnetoresistance in Bulk Samples of $La_{1-x}A_xMnO_3$ (A = Sr or Ca)

Mahesh, R and Mahendiran, R and Raychaudhuri, AK and Rao, CNR (1995) Giant Magnetoresistance in Bulk Samples of $La_{1-x}A_xMnO_3$ (A = Sr or Ca). In: Journal of Solid State Chemistry, 114 (1). pp. 297-299.

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## Abstract

Magnetoresistance measurements have been carried out on bulk samples of several members of the $La_{1-x}A_xMnO_3$ family (A = Sr and Ca) with varying x or $Mn^{4+}$ content. The magnitude of magnetoresistance (MR) is highest at the insulator-metal (I-M) transition when the transition temperature is relatively low $(\leq 250 K)$, The relative MR (%MR) is essentially the same (40-50%) at 4.2 K for all the compositions showing the I-M transition, namely $\sim 15\%$ at $T \geq 300 K$. Insulating compositions (small or large x) show smaller %MR than the compositions that undergo the I-M transition.

Item Type: Journal Article Copyright of this article belongs to Academic Press. Division of Chemical Sciences > Solid State & Structural Chemistry Unit 22 May 2007 19 Sep 2010 04:38 http://eprints.iisc.ernet.in/id/eprint/11040

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