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Large magnetic entropy change and magnetic properties in La (Fel-xMnx)ll.TSil.3Hy compounds
引用本文:王芳,陈远富,王光军,孙继荣,沈保根.Large magnetic entropy change and magnetic properties in La (Fel-xMnx)ll.TSil.3Hy compounds[J].中国物理 B,2003,12(8):911-914.
作者姓名:王芳  陈远富  王光军  孙继荣  沈保根
作者单位:State Key Laboratory of Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
基金项目:Project supported by the State Key Programme of Basic Research of China (973) (Grant No G 1998061303), by the National High Technology Development Programme of China (Grant No. 2002A A324010), and by the National Natural Science Foundation of China (Grant No 10174094).
摘    要:Magnetic properties and magnetic entropy change in La(Fe_{1-x}Mn_x)_{11.7}Si_{1.3}H_y compounds have been investigated. A significant increase of the Curie temperature T_C and a small increase of the saturation magnetizations μ_S have been observed after the introduction of interstitial H, which caused a slight volume expansion. The first-order field-induced itinerant-electron metamagnetic (IEM) transition remains and brings about a large magnetic entropy change around room temperatures for the compounds. The maximal magnetic entropy change is about 23.4, 17.7 and 15.9J/kg·K under a magnetic field change from 0 to 5T for x=0.01, 0.02 and 0.03, respectively. Therefore, the compounds appear to be potential candidates for magnetic refrigerants around room temperatures.

关 键 词:巨磁性  熵变  巡回电子变磁性转变  磁学性质  La(Fel-xMnx)ll.TSil.3Hy化合物  磁性材料
收稿时间:2003-02-12

Large magnetic entropy change and magnetic properties in La(Fe1-xMnx11.7Si1.3Hy compounds
Wang Fang,Chen Yuan-Fu,Wang Guang-Jun,Sun Ji-Rong and Shen Bao-Gen.Large magnetic entropy change and magnetic properties in La(Fe1-xMnx11.7Si1.3Hy compounds[J].Chinese Physics B,2003,12(8):911-914.
Authors:Wang Fang  Chen Yuan-Fu  Wang Guang-Jun  Sun Ji-Rong and Shen Bao-Gen
Institution:State Key Laboratory of Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
Abstract:Magnetic properties and magnetic entropy change in La(Fe_{1-x}Mn_x)_{11.7}Si_{1.3}H_y compounds have been investigated. A significant increase of the Curie temperature T_C and a small increase of the saturation magnetizations μ_S have been observed after the introduction of interstitial H, which caused a slight volume expansion. The first-order field-induced itinerant-electron metamagnetic (IEM) transition remains and brings about a large magnetic entropy change around room temperatures for the compounds. The maximal magnetic entropy change is about 23.4, 17.7 and 15.9J/kg·K under a magnetic field change from 0 to 5T for x=0.01, 0.02 and 0.03, respectively. Therefore, the compounds appear to be potential candidates for magnetic refrigerants around room temperatures.
Keywords:magnetic entropy change  itinerant-electron metamagnetic transition
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