Normal and inverse magnetocaloric effects in ferromagnetic Pr 0.58 Sr 0.42 MnO3

D. V. Maheswar Repaka, M. Aparnadevi, Pawan Kumar, T. S. Tripathi, R. Mahendiran*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

We report magnetization, magnetic entropy change (ΔS m ), and its correlation with magnetoresistance (MR) in Pr 0.58 Sr 0.42 MnO 3. It is shown that the magnetization upon field-cooling shows a steplike decrease at T S 134 K much below the ferromagnetic transition (T C 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 (ΔS m -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 T S (ΔS m 0.7 J/kg K) upon magnetization. The unusual inverse magnetocaloric effect found at T S within ferromagnetic state is ascribed to orthorhombic to monoclinic structural transition. We show that ΔS m 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 -ΔS m in the paramagnetic state at all magnetic fields above T C and at higher magnetic fields below T C . Such a close correlation between the magnetoresistance and the magnetic entropy change can be exploited to design efficient magnetocaloric materials.

Original languageEnglish
Article number17A906
JournalJournal of Applied Physics
Volume113
Issue number17
DOIs
Publication statusPublished - 7 May 2013
MoE publication typeA1 Journal article-refereed

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