Abstract Temperature dependence of the thermal conductivity of Mn1.03As0.70Sb0.30 and 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 near TC. 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.

中文翻译：

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巨磁热锰化合物的热导率

摘要 研究了Mn1.03As0.70Sb0.30 和Ru 掺杂或Ni 掺杂(MnFeRu)2(PSi) 的热导率的温度依赖性。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。在第一次冷却期间，在居里温度下，Ru 掺杂和 Ni 掺杂化合物的热导率突然降低。这是由于 FOMT 期间产生的微裂纹。在加热时，热导率显示出正的温度依赖性。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的总和给出。