Room temperature magnetic entropy change and magnetoresistance in La0.70(Ca0.30-xSrx)MnO3:Ag 10% (x=0.0-0.10)

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:324

Article

Jha, R.¹  Singh, Shiva Kumar¹  Kumar, Anuj¹  Awana, V. P. S.¹ 

[1] Natl Phys Lab, CSIR, Quantum Phenomena & Applicat Div, New Delhi 110012, India

关键词: Manganite;    Magnetization;    Magnetocaloric effect;    Magnetoresistance;   

DOI  :  10.1016/j.jmmm.2012.04.026

来源: Elsevier

【 摘 要 】

The magnetic and magnetocaloric properties of polycrystalline La-0.70(Ca0.30-xSrx)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 298 K 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 300 K is found to be as large as 31% with magnetic field change of 1 T, whereas it reaches up to 49% at magnetic field of 3 T for the La0.70Ca0.20Sr0.10MnO3:Ag-0.10 sample. The maximum entropy change (Delta S-Mmax) at near its T-c (300.5 K) is 7.61 J kg(-1) K-1 upon the magnetic field change of 5 T. The La0.70Ca0.20Sr0.10MnO3:Ag-0.10 sample having good MR (31%(1 T), 49%(3 T)) and reasonable change in magnetic entropy (7.6 J kg(-1).K-1, 5 T) at 300 K can be a potential magnetic refrigerant material at ambient temperatures. (C) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

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