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https://doi.org/10.1063/1.4793599
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 | Citation: | 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. https://doi.org/10.1063/1.4793599 | 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 | URI: | http://scholarbank.nus.edu.sg/handle/10635/98816 | ISSN: | 00218979 | DOI: | 10.1063/1.4793599 |
Appears in Collections: | Staff Publications |
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