Thermal conductivity of giant magnetocaloric Mn compounds
Thermal conductivity of giant magnetocaloric Mn compounds
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DOI：
10.1016/j.jallcom.2019.01.188
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发表时间：
2019-05
影响因子：
6.2
通讯作者：
H. Wada;Kosuke Fukuda;Takayuki Ohnishi;K. Soejima;Kensuke Otsubo;K. Yamashita
中科院分区：
文献类型：
--
作者：
H. Wada;Kosuke Fukuda;Takayuki Ohnishi;K. Soejima;Kensuke Otsubo;K. Yamashita
研究了Mn_（1.03）As_（0.70）Sb_（0.30）和掺Ru或掺Ni的（MnFeRu）_2（PSi）的热导率随温度的变化关系。这些化合物在室温附近经历一级磁转变（FOMT），并在居里温度附近表现出巨磁热效应。Ru掺杂和Ni掺杂的化合物的热导率在第一次冷却期间在居里温度下突然降低。这是由于FOMT过程中产生的微裂纹。在加热时，热导率显示正的温度依赖性。Ru掺杂和Ni掺杂的化合物在TC附近的热导率的温度依赖性中显示出小的驼峰。铁磁金属的热导率由声子分量、电子分量和磁性分量之和给出。考虑到每个组件的温度依赖性的结果进行了讨论。
Temperature dependence of the thermal conductivity of Mn1.03As0.70Sb0.30and Ru-doped or Ni-doped (MnFeRu)2(PSi) was studied. These compounds undergo a first-order magnetic transition (FOMT) near room temperature and exhibit a giant magnetocaloric effect at around the Curie temperature. The thermal conductivity of Ru-doped and Ni-doped compounds is abruptly reduced at the Curie temperature during the first cooling. This is due to the micro-cracks generated during the FOMT. On heating, the thermal conductivity shows positive temperature dependence. The Ru-doped and Ni-doped compounds show small humps in the temperature dependence of the thermal conductivity nearTC. The thermal conductivity of ferromagnetic metals is given by the sum of the phonon component, the electronic component, and the magnetic component. The results are discussed by taking account of the temperature dependence of each component.