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Thermal relaxation in charge ordered $Pr_{0.63}Ca_{0.37}MnO_3$ in the presence of a magnetic field

Raychaudhuri, AK and Guha, Ayan and Das, I and Rawat, R and Rao, CNR (2001) Thermal relaxation in charge ordered $Pr_{0.63}Ca_{0.37}MnO_3$ in the presence of a magnetic field. In: Solid State Communications, 120 (7-8). pp. 303-306.

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We report the observation of substantial thermal relaxation in a single crystal of the charge ordered system $Pr_{0.63}Ca_{0.37}MnO_3$ in an applied magnetic field of H=8 T. The relaxation is observed when the temperature is scanned in the presence of a magnetic field in the temperature interval $T_{MH}<T<T_{CO}$, where $T_{CO}$ is the charge ordering temperature and $T_{MH}$ is the charge melting temperature in a field. In this temperature range, the system has coexisting charged ordered insulator (COI) and ferromagnetic metallic (FMM) phases. No such relaxation is observed in the COI state in H=0 T or in the FMM phase at $T<T_{MH}$ in the presence of a magnetic field. We conclude that the thermal relaxation is due to two coexisting phases with nearly the same free energies but separated by a potential barrier. This barrier makes the transformation from one phase to the other time-dependent in the scale of the specific heat experiment and gives rise to the thermal relaxation.

Item Type: Journal Article
Publication: Solid State Communications
Publisher: Elsevier
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Insulators;Metals;Heat capacity.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 13 Oct 2008 04:59
Last Modified: 19 Sep 2010 04:50
URI: http://eprints.iisc.ac.in/id/eprint/16016

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