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Chin. Phys. B, 2015, Vol. 24(5): 050701    DOI: 10.1088/1674-1056/24/5/050701
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Magnetocaloric effect study of SrFe0.8Co0.2O3 single crystal prepared under high pressure

Xia Hai-Lianga b, Qin Xiao-Meia, Yang Jun-Yeb, Yin Yun-Yub, Dai Jian-Hongb, Shi Wang-Zhoua, Long You-Wenb c
a Department of Physics, Shanghai Normal University, Shanghai 200234, China;
b Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
c Collaborative Innovation Center of Quantum Matter, Beijing 100190, China
Abstract  

A high-quality SrFe0.8Co0.2O3 single crystal is prepared by combining floating-zone and high-pressure treatment methods. Its Magnetocaloric effect is investigated by magnetic measurements. A paramagnetism-to-ferromagnetism transition is found at about 270 K and this transition is a second-order one in nature as confirmed by Arrott plots. The saturated moment obtained at 2 K and 7 T is 3.63 μB/f.u. The maximal value of magnetic entropy change measured at 5 T is about 4.0 J·kg-1·K-1. The full wide at half maximum for a magnetic entropy change peak observed in SrFe0.8Co0.2O3 is considerably large. As a consequence, the relative cooling power value of SrFe0.8Co0.2O3 obtained at 5 T is 331 J/kg, which is greatly higher than those observed in other perovskite oxides. The present work therefore provides a promising candidate for magnetic refrigeration near room temperature.

Keywords:  high pressure synthesis      magnetocaloric effect      ferromagnetic phase transition     
Received:  29 January 2015      Published:  05 May 2015
PACS:  07.35.+k (High-pressure apparatus; shock tubes; diamond anvil cells)  
  75.30.Sg (Magnetocaloric effect, magnetic cooling)  
  75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))  
Fund: 

Project supported by the National Basic Research Program of China (Grant No. 2014CB921500) and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB07030300).

Corresponding Authors:  Qin Xiao-Mei, Long You-Wen     E-mail:  xmqin@shnu.edu.cn;ywlong@iphy.ac.cn
About author:  07.35.+k; 75.30.Sg; 75.30.Kz

Cite this article: 

Xia Hai-Liang, Qin Xiao-Mei, Yang Jun-Ye, Yin Yun-Yu, Dai Jian-Hong, Shi Wang-Zhou, Long You-Wen Magnetocaloric effect study of SrFe0.8Co0.2O3 single crystal prepared under high pressure 2015 Chin. Phys. B 24 050701

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