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*

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

2 Sitaatiot (Scopus)

Abstrakti

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.

AlkuperäiskieliEnglanti
Artikkeli17A906
JulkaisuJournal of Applied Physics
Vuosikerta113
Numero17
DOI - pysyväislinkit
TilaJulkaistu - 7 toukokuuta 2013
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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