Magnetocaloric and transport study of poly- and nanocrystalline composite manganites La0.7Ca0.3MnO3/La0.8Sr0.2MnO3

被引：45
|
作者：
Pekala, M. [1 ]
Pekala, K. [2 ]
Drozd, V. [3 ]
Staszkiewicz, K. [1 ,4 ]
Fagnard, J. -F. [5 ]
Vanderbemden, P. [5 ]
机构：
[1] Univ Warsaw, Dept Chem, PL-02089 Warsaw, Poland
[2] Tech Univ Warsaw, Fac Phys, PL-00662 Warsaw, Poland
[3] Florida Int Univ, Ctr Study Matter Extreme Condit, Miami, FL 33199 USA
[4] Univ Warsaw, Coll Interfac Individual Studies Math & Nat Sci, PL-02089 Warsaw, Poland
[5] Univ Liege, Dept Elect Engn & Comp Sci B28, SUPRATECS, B-4000 Liege, Belgium
来源：
JOURNAL OF APPLIED PHYSICS | 2012年 / 112卷 / 02期
关键词：
LA0.7CA0.3MNO3;
D O I：
10.1063/1.4739262
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Magnetocaloric and transport properties are reported for novel poly-and nanocrystalline double composite manganites, La0.8Sr0.2MnO3/La0.7Ca0.3MnO3, prepared by the sol-gel method. Magnetic field dependence of magnetic entropy change is found to be stronger for the nano-than the polycrystalline composite. The remarkable broadening of the temperature interval, where the magnetocaloric effect occurs in poly-and nanocrystalline composites, causes the relative cooling power (RCP(S)) of the nanocrystalline composite to be reduced by only 10% compared to the Sr based polycrystalline phase. The RCP(S) of the polycrystalline composite becomes remarkably enhanced. The low temperature magnetoresistance is enhanced by 5% for the nanostructured composite. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4739262]
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页数：8
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