Thermal conductivity of giant magnetocaloric Mn compounds

JOURNAL OF ALLOYS AND COMPOUNDS

卷:785

Article

Wada, Hirofumi¹  Fukuda, Kosuke¹  Ohnishi, Takayuki²  Soejima, Kei²  Otsubo, Kensuke²  Yamashita, Keiichiro² 

[1] Kyushu Univ, Dept Phys, Nishi Ku, Motooka 744, Fukuoka, Fukuoka 8190395, Japan

[2] Dyden Cooperat, Res & Dev Grp, Kamimine, Saga 8490124, Japan

关键词: Thermal conductivity;    Magnetocaloric effect;    Electrical resistivity;    First-order magnetic transition;   

DOI  :  10.1016/j.jallcom.2019.01.188

来源: Elsevier

【 摘 要 】

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 T-C. 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. (C) 2019 Elsevier B.V. All rights reserved.

【 授权许可】

Free