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Chin. Phys. B, 2015, Vol. 24(9): 097502    DOI: 10.1088/1674-1056/24/9/097502
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Magnetic properties and magnetocaloric effects in Er1-xGdxCoAl intermetallic compounds

Gao Xin-Qianga b, Mo Zhao-Juna b, Shen Junb, Li Keb, Dai Weib, Wu Jian-Fengb, Tang Cheng-Chuna
a School of Material Science and Engineering, Hebei University of Technology, Tianjin 300384, China;
b Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Abstract  The magnetism and magnetocaloric effect in Er1-xGdxCoAl (x = 0, 0.1, 0.2, 0.4, 0.6, 0.8, 1) were investigated. The Er1-xGdxCoAl compounds were synthesized by arc melting. With the increasing Gd content, the Néel temperature (TN) linearly increases from 14 K to 102 K, while the magnetic entropy change (-Δ SM) tends to decrease nonmonotonously. Under the field change from 0 T to 5 T, the-Δ SM of the compounds with x = 0.2-1 are stable around 10 J/kg ·K, then a cooling platform between 20 K and 100 K can be formed by combining these compounds. For x = 0.6, 0.8, 1.0, the compounds undergo two successive magnetic transitions, one antiferromagnetism to ferromagnetism and the other ferromagnetism to paramagnetism, with increasing temperature. The two continuous magnetic transitions in this series are advantageous to broaden the temperature span of half-peak width (δ T) in the-Δ xM-T curve and improve the refrigeration capacity.
Keywords:  mgnetocaloric effect      magnetic entropy change      magnetic phase transformation     
Received:  16 October 2014      Published:  05 September 2015
PACS:  75.30.Sg (Magnetocaloric effect, magnetic cooling)  
  65.40.gd (Entropy)  
  75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51322605 and 51271192).
Corresponding Authors:  Shen Jun, Tang Cheng-Chun     E-mail:  jshen@mail.ipc.ac.cn;tangcc@hebut.edu.cn

Cite this article: 

Gao Xin-Qiang, Mo Zhao-Jun, Shen Jun, Li Ke, Dai Wei, Wu Jian-Feng, Tang Cheng-Chun Magnetic properties and magnetocaloric effects in Er1-xGdxCoAl intermetallic compounds 2015 Chin. Phys. B 24 097502

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