Investigation of magnetocaloric effect in La0.45Pr0.25Ca0.3MnO3 by magnetic, differential scanning calorimetry and thermal analysis

Journal of Magnetism and Magnetic Materials 324 (2012) 3351–3355

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Investigation of magnetocaloric effect in La0.45Pr0.25Ca0.3MnO3 by magnetic, differential scanning calorimetry and thermal analysis
M. Aparnadevi, S.K. Barik, R. Mahendiran n
Department of Physics, 2 Science Drive 3, National University of Singapore, Lower Kent Ridge Road, Singapore-117 452, Singapore

a r t i c l e i n f o

abstract

Article history:
Received 7 March 2012
Available online 5 June 2012

We investigated magnetocaloric effect in La0.45Pr0.25Ca0.3MnO3 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 TC ¼ 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
DSm ¼ À 7.2 J kg À 1 K À 1 at T¼ 212.5 K and refrigeration capacity of 228 J kg À 1 are found for a field change of DH¼ 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.
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Keywords:
Manganite
Magnetization
Magnetocaloric effect
Metamagnetic transition

1. Introduction
In recent years, magnetic refrigeration has attracted considerable attention because it is considered to be a viable alternative to conventional gas compression based refrigeration due

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