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Magnetic entropy change and large refrigerant capacity of Ce6i2Si3-type GdCoSiGe compound |
| Shen Jun(沈俊)a)†,Zhang Hu(张虎)b),and Wu Jian-Feng(吴剑峰)a) |
| a Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China; b State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract Magnetic entropy change ($\Delta S_{\rm M})$ and refrigerant capacity ($RC$) of Ce$_{6}$Ni$_{2}$Si$_{3}$-type Gd$_{6}$Co$_{1.67}$Si$_{2.5}$Ge$_{0.5}$ compounds have been investigated. The Gd$_{6}$Co$_{1.67}$Si$_{2.5}$Ge$_{0.5}$ undergoes a reversible second-order phase transition at the Curie temperature $T_{\rm C} = 296$ K. The high saturation magnetization leads to a large $\Delta S_{\rm M}$ and the maximal value of $\Delta S_{\rm M}$ is found to be 5.9 J/kg$\cdot$K around $T_{\rm C}$ for a field change of 0--5 T. A broad distribution of the $\Delta S_{\rm M}$ peak is observed and the full width at half maximum of the $\Delta S_{\rm M}$ peak is about 101~K under a magnetic field of 5 T. The large $RC$ is found around $T_{\rm C}$ and its value is 424 J/kg.
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Received: 18 August 2010
Revised: 28 September 2010
Accepted manuscript online:
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PACS:
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75.30.Sg
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(Magnetocaloric effect, magnetic cooling)
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75.50.Cc
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(Other ferromagnetic metals and alloys)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11004204 and 51001114), the Knowledge Innovation Project of the Chinese Academy of Sciences, and the National Basic Research Program of China (Grant No. 2006CB601101). |
Cite this article:
Shen Jun(沈俊), Zhang Hu(张虎), and Wu Jian-Feng(吴剑峰) Magnetic entropy change and large refrigerant capacity of Ce6i2Si3-type GdCoSiGe compound 2011 Chin. Phys. B 20 027501
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