Magnetic and calorimetric studies of magnetocaloric effect in La 0.7-xPr xCa 0.3MnO 3
Barik, S.K. Aparnadevi, M. Rebello, A. Naik, V.B. Mahendiran, R.
Aparnadevi, M.
Rebello, A.
Naik, V.B.
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Abstract
We report magnetocaloric effect in La 0.7-xPr xCa 0.3MnO 3 (x = 0, 0.2, 0.3, and 0.4). All these compounds undergo first-order paramagnetic to ferromagnetic transition upon cooling and show field-induced metamagnetic transition (FIMMT) in the paramagnetic state. The FIMMT is accompanied by a release of latent heat and change in temperature of the sample as evidenced from differential scanning calorimetry and thermal analysis data for x = 0.3. The magnetic entropy decreases (-δS m 8.23, 8.1, 7, and 5.38 Jkg -1 K -1 for a field change of δH 5 T, for x = 0, 0.2, 0.3, and 0.4, respectively) and refrigeration capacity (RC) increases with increasing x (RC 197, 215, 240, and 259 J/kg for x = 0, 0.2, 0.3, and 0.4, respectively). We suggest that collapse of magnetic polarons in the paramagnetic state and magnetovolume effect are responsible for the observed FIMMT and large -δS m values. © 2012 American Institute of Physics.
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Journal of Applied Physics
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Date
2012-04-01
DOI
10.1063/1.3679441
Type
Conference Paper