Magnetoresistance of the spin-state-transition compound La1−xSrxCoO3

Mahendiran, R. ; Raychaudhuri, A. K. (1996) Magnetoresistance of the spin-state-transition compound La1−xSrxCoO3 Physical Review B: Condensed Matter and Materials Physics, 54 (22). pp. 16044-16052. ISSN 1098-0121

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We have investigated the magnetoresistance (MR) of the perovskite oxide La1−xSrxCoO3 for 0≤x≤0.4 which shows a spin-state transition from low-spin CoIII to high-spin Co3+ as a function of temperature. In the metallic compositions (x≤0.25) 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 Tc. In the insulating samples (x≤0.2) 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 Co3+ ions in the electronic transport leading to a characteristic behavior of the MR in the Co3+-rich insulating samples.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:42653
Deposited On:04 Jun 2011 13:40
Last Modified:04 Jun 2011 13:40

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