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Mossbauer study of La1-xCaxMn1-y (57)FeyO(3) with x = 0, 0.25; y=0.01

Shah, Prasanna and Gupta, Ajay and Sarma, DD and Kawaguchi, K (2002) Mossbauer study of La1-xCaxMn1-y (57)FeyO(3) with x = 0, 0.25; y=0.01. In: Hyperfine Interactions, 139 (1-4). pp. 623-629.

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Abstract

Temperature dependent Mossbauer measurements are done on the samples of La1- xCaxMn1-y (FeyO3)-Fe-57 with x=0 and 0.25, and y=0.01. With decreasing temperature, the specimen with x=0.25 shows a paramagnetic to ferromagnetic transition around 175 K. In the specimen x=0.0, the temperature dependence of both the center shift (delta) and the recoilless fraction (f) can be fitted very well with the Debye theory with a theta(D)=320+/-50 K. But for the specimens with x=0.25, f and delta show distinct deviations from the Debye behavior in the temperature range in which the resistivity shows a sharp decrease. Dips observed in both the f and delta around the transition temperature suggest that the Jahn-Teller distortion observed in these systems is dynamic in nature.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Springer.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 20 Jul 2011 09:57
Last Modified: 20 Jul 2011 09:57
URI: http://eprints.iisc.ernet.in/id/eprint/39292

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