Chin. Phys. Lett.  2009, Vol. 26 Issue (8): 087401    DOI: 10.1088/0256-307X/26/8/087401
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Structural, Magnetic and Magnetocaloric Properties of La-deficient La0.77-xSrxCa0.2MnO3 Perovskites
ZHAO Xu1, CHEN Wei1, LI Ai-Jun1,2, MA Li-Mei1, ZONG Yun1
1Department of Physics and Hebei Advanced Thin Film Laboratory, Hebei Normal University, Shijiazhuang 0500162Department of Physics, Xi'an Institute of High Technology, Xi'an 710025
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ZHAO Xu, CHEN Wei, LI Ai-Jun et al  2009 Chin. Phys. Lett. 26 087401
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Abstract La-deficient La0.77-xCa0.2SrxMnO3 (0≤x≤0.1) polycrystalline samples are synthesized using the sol-gel technique. The crystal structures of all the samples are single orthorhombic phase with Pbnm space group. Rietveld analysis of x-ray diffraction patterns shows that the Mn-O-Mn bond angle θMn-O-Mn increases whereas the Mn-O bond length dMn--O decreases monotonically with increasing Sr2+ content, which results in a rich overlap between Mn 3d and O 2p orbitals and leads to a systematic increase of the Curie temperature in this compound. It is found that the magnetic entropy change has a maximum at x=0.06 in La3+-deficient La0.77-xCa0.2SrxMnO3. This may result from competition between the super-exchange interactions (Mn4+-O2--Mn4+) and double-exchange interactions (Mn3+-O2--Mn4+) originating from the appearance of superfluous Mn4+ ions by substitution of Sr2+ for La3+ in this series. Large magnetic entropy changes of 2.32 and 1.83Jkg-1K-1 in the x= 0.06 and x= 0.1 samples at their TCs of 271K and 303K upon a low magnetic field (10kOe) make these materials promising candidates at near room temperature.
Keywords: 74.25.Ha      75.30.Sg     
Received: 11 March 2009      Published: 30 July 2009
PACS:  74.25.Ha (Magnetic properties including vortex structures and related phenomena)  
  75.30.Sg (Magnetocaloric effect, magnetic cooling)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/26/8/087401       OR      https://cpl.iphy.ac.cn/Y2009/V26/I8/087401
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ZHAO Xu
CHEN Wei
LI Ai-Jun
MA Li-Mei
ZONG Yun
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