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|Title:||Normal and inverse magnetocaloric effects in ferromagnetic Pr 0.58Sr0.42MnO3|
|Authors:||Maheswar Repaka, D.V.|
|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. 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|
|Appears in Collections:||Staff Publications|
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