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Title: Normal and inverse magnetocaloric effects in ferromagnetic Pr 0.58Sr0.42MnO3
Authors: Maheswar Repaka, D.V.
Aparnadevi, M.
Kumar, P.
Tripathi, T.S.
Mahendiran, R. 
Issue Date: 7-May-2013
Source: Maheswar Repaka, D.V., Aparnadevi, M., Kumar, P., Tripathi, T.S., Mahendiran, R. (2013-05-07). Normal and inverse magnetocaloric effects in ferromagnetic Pr 0.58Sr0.42MnO3. Journal of Applied Physics 113 (17) : -. ScholarBank@NUS Repository.
Abstract: We report magnetization, magnetic entropy change (ΔSm), and its correlation with magnetoresistance (MR) in Pr0.58Sr 0.42MnO3. It is shown that the magnetization upon field-cooling shows a steplike decrease at TS 134 K much below the ferromagnetic transition (TC 300 K). While the low temperature transition is first-order, the high temperature transition is second-order as suggested by the hysteresis behavior in magnetization. In a magnetic field range accessible with an electromagnet, the magnetic entropy decreases at T C (ΔSm -2.33 J/kg K with a refrigeration capacity of 65.88 J/kg for a magnetic field change of ΔH 2 T) whereas it increases at TS (ΔSm 0.7 J/kg K) upon magnetization. The unusual inverse magnetocaloric effect found at TS within ferromagnetic state is ascribed to orthorhombic to monoclinic structural transition. We show that ΔSm versus T curves under different magnetic fields can be collapsed into a single master curve using a scaling method. Importantly, we find that negative MR increases linearly with -ΔSm in the paramagnetic state at all magnetic fields above TC and at higher magnetic fields below TC. Such a close correlation between the magnetoresistance and the magnetic entropy change can be exploited to design efficient magnetocaloric materials. © 2013 American Institute of Physics.
Source Title: Journal of Applied Physics
ISSN: 00218979
DOI: 10.1063/1.4793599
Appears in Collections:Staff Publications

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