Specific heat of single-crystalline $Pr_{0.63}Ca_{0.37}MnO_3$ in the presence of a magnetic field

Raychaudhuri, AK and Guha, Ayan and Das, I and Rawat, R and Rao, CNR (2001) Specific heat of single-crystalline $Pr_{0.63}Ca_{0.37}MnO_3$ in the presence of a magnetic field. In: Physical Review B, 64 (16). 165111-1-165111-9.

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Abstract

We present the results of a study of the specific heat on a single crystal of $Pr_{0.63}Ca_{0.37}MnO_3$ performed over a temperature range 3–300 K in the presence of 0 and 8 T magnetic fields. An estimate of the entropy and latent heat in a magnetic field at the first-order charge-ordering (CO) transition is presented. The total entropy change at the CO transition, which is $\approx 1.8$ J/mol K at 0 T, decreases to $\sim 1.5$ J/mol K in the presence of a 8 T magnetic field. Our measurements enable us to estimate the latent heat $L_{CO} \approx 235$ J/mol involved in the CO transition. Since the entropy of the ferromagnetic metallic (FMM) state is comparable to that of the chargeordered insulating state, a subtle change in entropy stabilizes either of these two states. Our low-temperature specific heat measurements reveal that the linear term is absent at 0 T and surprisingly not seen even in the metallic FMM state.

Item Type:	Journal Article
Publication:	Physical Review B
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to the American Physical Society.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	26 Sep 2008 07:14
Last Modified:	19 Sep 2010 04:50
URI:	http://eprints.iisc.ac.in/id/eprint/16044

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