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.

PDF Thermal.pdf - Published Version Restricted to Registered users only Download (99kB) | Request a copy

Abstract

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

Actions (login required)

View Item