Giant magnetic entropy change in colossal magnetoresistance in La0.7Ca0.3MnO3 material in low field

Authors

Jyotish Debnath, University of WollongongFollow
Rong Zeng, University of WollongongFollow
Jung Ho Kim, University of WollongongFollow
S X. Dou, University of WollongongFollow

RIS ID

32913

Publication Details

Debnath, J, Zeng, R, Kim, J & Dou, SX, (2010), Giant magnetic entropy change in colossal magnetoresistance in La0.7Ca0.3MnO3 material in low field, Journal of Applied Physics, 107(9), pp. 1-3.

Abstract

The structural, magnetic, and magnetocaloric properties of the manganite La_0.7Ca_0.3MnO₃ have been studied. Change in the giant magnetic entropy was observed without any noticeable magnetic hysteresis but with small thermal hysteresis losses. We observed a first order magnetic phase transition around 251 K. The magnetic entropy change observed in this work is estimated to be 5.27 J/kg K for field changes from 0 to 1.5 T based on magnetization measurements. This value is about twice as large as those for other perovskite manganites and is even larger than for Gd-based magnetic materials at low fields. In addition, the entropy change was estimated by using the heat capacity method, which can be well explained by the Maxwell relation.

Grant Number

ARC/DP0879070

Additional Grant Number

http://purl.org/au-research/grants/ARC/DP0879070