Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/98785
Title: Magnetic and calorimetric studies of magnetocaloric effect in La 0.7-xPr xCa 0.3MnO 3
Authors: Barik, S.K. 
Aparnadevi, M.
Rebello, A.
Naik, V.B.
Mahendiran, R. 
Issue Date: 1-Apr-2012
Citation: Barik, S.K., Aparnadevi, M., Rebello, A., Naik, V.B., Mahendiran, R. (2012-04-01). Magnetic and calorimetric studies of magnetocaloric effect in La 0.7-xPr xCa 0.3MnO 3. Journal of Applied Physics 111 (7) : -. ScholarBank@NUS Repository.
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.
Source Title: Journal of Applied Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/98785
ISSN: 00218979
Appears in Collections:Staff Publications

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