TY - JOUR
T1 - Thermal conductivity of giant magnetocaloric Mn compounds
AU - Wada, Hirofumi
AU - Fukuda, Kosuke
AU - Ohnishi, Takayuki
AU - Soejima, Kei
AU - Otsubo, Kensuke
AU - Yamashita, Keiichiro
N1 - Funding Information:
We express our gratitude to Dr. Masakazu Ito, Kagoshima University, for his technical advice on the measurements of thermal conductivity. This work was partially supported by JSPS KAKENHI Grant Number 16K04932 and by the Advanced Low Carbon Technology Research and Development Program (ALCA) of the Japan Science and Technology Agency (JST) JPMJAL1408 .
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/5/15
Y1 - 2019/5/15
N2 - 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.
AB - 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.
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U2 - 10.1016/j.jallcom.2019.01.188
DO - 10.1016/j.jallcom.2019.01.188
M3 - Article
AN - SCOPUS:85060314064
SN - 0925-8388
VL - 785
SP - 445
EP - 451
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -