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Magnetoresistance of the spin-state-transition compound $La_ {1-x}Sr_xCoO_3$

Mahendiran, R and Raychaudhuri, AK (1996) Magnetoresistance of the spin-state-transition compound $La_ {1-x}Sr_xCoO_3$. In: Physical Review B, 54 (22). pp. 16044-16052.

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We have investigated the magnetoresistance MR! of the perovskite oxide $La_ {1-x}Sr_xCoO_3$ for $0{\leq}x{\leq}0.4$ which shows a spin-state transition from low-spin $Co^{III}$ to high-spin $Co^{3+}$ as a function of temperature. In the metallic compositions $(x\geq0.25)$ appreciable MR occurs only near the ferromagnetic Curie temperature. For the most metallic composition x=0.4, there is a small positive contribution to the MR near the $T_c$ . In the insulating samples $(x\leq0.2)$ the MR shows a large hysteresis which depends on the temperature. The value of the MR is negative and large in the insulating compositions and shows a maximum near the temperature where magnetic studies showed a spin-glass-like transition. We also find a strong role of the spin-state transition of the $Co^{3+}$ ions in the electronic transport leading to a characteristic behavior of the MR in the $Co^{3+}$-rich insulating samples.

Item Type: Journal Article
Publication: Physical Review B
Publisher: American Physical society
Additional Information: Copyright of this article belongs to American Physical society.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 24 Nov 2006
Last Modified: 19 Sep 2010 04:32
URI: http://eprints.iisc.ac.in/id/eprint/9015

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