Thermoelectric Properties of Valence-Fluctuating Eu Compound with a Clathrate-Like Structure, Eu_3Pd_<20>Ge_6(Condensed Matter : Electronic Structure, Electrical, Mgagnetic and Optical Properties)

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概要

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• We have found that in the series of R_3Pd_<20>X_6 (R=rare-earth element, X=Si or Ge), only Eu_3Pd_<20>Ge_6 shows valence-fluctuating behavior. The Eu atoms are caged in two kinds of polyhedra composed of Pd or Ge atoms, forming a clathrate-like structure. Since a rattling motion of the Eu atoms in the cages was expected, we have assessed the thermoelectric properties of Eu_3Pd_<20>Ge_6 by measuring its electrical resistivity, thermopower and thermal conductivity. Eu_3Pd_<20>Ge_6 shows good electrical conductivity. Reflecting the valence-fluctuating state, the thermopower reaches a maximum value of about 10 μV/K around 120K. The thermal conductivity larger than 10 W/mK at high temperatures indicates a negligible rattling of Eu atoms.

• 社団法人日本物理学会の論文
• 2002-05-15

著者

• Kitagawa J

  Hiroshima Univ. Higashi‐hiroshima

• Kitagawa Jiro

  Department Of Quantum Matter Adsm Hiroshima University

• TAKABATAKE Toshiro

  Department of Quantum Matter,Graduate School of Advanced Science of Matter,Hiroshima University

• Takabatake T

  Hiroshima Univ. Hiroshima

• SASAKAWA Tetsuya

  Department of Quamtam Matter, ADSM, Hiroshima University

• ISHIKAWA Masayasu

  Institute for Solid State Physics, University of Tokyo

• SUEMITSU Toshiaki

  Department of Quantum Matter, ADSM, Hiroshima University

• Sasakawa Tetsuya

  Graduate School Of Advanced Sciences Of Matter Hiroshima University

• Takabatake Toshiro

  Department Of Quantum Matter Adsm Hiroshima University

• Suemitsu T

  Department Of Quantum Matter Adsm Hiroshima University

• Ishikawa M

  Univ. Tsukuba Ibaraki

• Ishikawa Y

  Toshiba Research And Development Center Kawasaki

• Ishikawa M

  Univ. Tokyo Osaka

• Ishikawa M

  Institute For Solid State Physics University Of Tokyo

• Suzuki T

  Graduate School Of Science And Technology Chiba University

• Suemitsu Toshiaki

  Department Of Quantum Matter Adsm Hiroshima University

• Saita Tetsuro

  Graduate School Of Engineering Science Osaka University

• Ishikawa Masayasu

  Institute For Solid State Physics The University Of Tokyo

• Iino Masaaki

  The Institute For Solid State Physics The University Of Tokyo

• Sasagawa Takao

  Graduate School Of Frontier Sciences University Of Tokyo

• Sasakawa Tetsuya

  Department Of Quamtam Matter Adsm Hiroshima University

• Kitagawa Jiro

  Department of Electrical Engineering, Faculty of Engineering, Fukuoka Institute of Technology, Fukuoka 811-0295, Japan

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