1. Room temperature magnetic entropy change and magnetoresistance in La0.70(Ca0.30−x Sr x )MnO3:Ag 10% (x=0.0−0.10)
- Author
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Jha, R., Singh, Shiva Kumar, Kumar, Anuj, and Awana, V.P.S
- Subjects
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MAGNETORESISTANCE , *ENTROPY , *TEMPERATURE effect , *LANTHANUM compounds , *CALCIUM compounds , *MANGANITE , *SPACE groups - Abstract
Abstract: The magnetic and magnetocaloric properties of polycrystalline La0.70(Ca0.30−x Sr x )MnO3:Ag 10% manganite have been investigated. All compositions are crystallized in single phase orthorhombic Pbnm space group. Both, the insulator–metal transition temperature (T IM ) and Curie temperature (T c ) are observed at 298K for x=0.10 composition. Though both T IM and T c are nearly unchanged with Ag addition, the MR is increased. The MR at 300K is found to be as large as 31% with magnetic field change of 1T, whereas it reaches up to 49% at magnetic field of 3T for the La0.70Ca0.20Sr0.10MnO3:Ag0.10 sample. The maximum entropy change (ΔS Mmax ) at near its T c (300.5K) is 7.6Jkg−1 K−1 upon the magnetic field change of 5T. The La0.70Ca0.20Sr0.10MnO3:Ag0.10 sample having good MR (31%1T, 49%3T) and reasonable change in magnetic entropy (7.6Jkg−1.K−1, 5T) at 300K can be a potential magnetic refrigerant material at ambient temperatures. [Copyright &y& Elsevier]
- Published
- 2012
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