Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jmmm.2012.05.053
Title: Investigation of magnetocaloric effect in La 0.45Pr 0.25Ca 0.3MnO 3 by magnetic, differential scanning calorimetry and thermal analysis
Authors: Aparnadevi, M.
Barik, S.K. 
Mahendiran, R. 
Keywords: Magnetization
Magnetocaloric effect
Manganite
Metamagnetic transition
Issue Date: Oct-2012
Source: Aparnadevi, M., Barik, S.K., Mahendiran, R. (2012-10). Investigation of magnetocaloric effect in La 0.45Pr 0.25Ca 0.3MnO 3 by magnetic, differential scanning calorimetry and thermal analysis. Journal of Magnetism and Magnetic Materials 324 (20) : 3351-3355. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jmmm.2012.05.053
Abstract: We investigated magnetocaloric effect in La 0.45Pr 0.25Ca 0.3MnO 3 by direct methods (changes in temperature and latent heat) and indirect method (magnetization isotherms). This compound undergoes a first-order paramagnetic to ferromagnetic transition with T C=200 K upon cooling. The paramagnetic phase becomes unstable and it transforms into a ferromagnetic phase under the application of magnetic field, which results in a field-induced metamagnetic transition (FIMMT). The FIMMT is accompanied by release of latent heat and temperature of the sample as evidenced from differential scanning calorimetry and thermal analysis experiments. A large magnetic entropy change of ΔS m=-7.2 J kg -1 K -1 at T=212.5 K and refrigeration capacity of 228 J kg -1 are found for a field change of ΔH=5 T. It is suggested that destruction of magnetic polarons and growth of ferromagnetic phase accompanied by a lattice volume change with increasing magnetic field is responsible for the large magnetocaloric effect in this compound. © 2012 Elsevier B.V. All rights reserved.
Source Title: Journal of Magnetism and Magnetic Materials
URI: http://scholarbank.nus.edu.sg/handle/10635/96978
ISSN: 03048853
DOI: 10.1016/j.jmmm.2012.05.053
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