Strong Effect of Yb Filling Fraction on the Magnetic Ground Sate of the Filled Skutterudite YbFe4Sb12

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概要

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• YbFe4Sb12 single crystals with the Yb-site filling fraction close to 100% have been successfully synthesized by the Sb self-flux method under a pressure of 4 GPa. The grown single crystals do not exhibit ferromagnetic ordering down to the lowest temperature investigated, in contrast with the ferromagnetic transition reported for Yb-deficient single crystals grown at ambient pressure. The electronic specific heat coefficient of the present crystals is evidently smaller than those reported for Yb-deficient samples, indicating that the Fermi energy is located at the high-energy side of a peak in the electronic density of states dominated by the contribution of Fe-3d electrons. Therefore, the appearance of the ferromagnetic state in the Yb-deficient samples can be naively understood within the simple Stoner-type argument. Marked enhancement of the positive magnetoresistance was found in the temperature region where the spin-fluctuation scattering of conduction electrons dominates.

• 2011-06-15

著者

• TATSUOKA Sho

  Department of Physics, Tokyo Metropolitan University

• TANAKA Kenya

  Department of Physics, Tokyo Metropolitan University

• Aoki Yuji

  Department Of Physics Tokyo Metropotitan University

• Aoki Yuji

  Department Of Chemistry Faculty Of Science Gakushuin University

• Aoki Yuji

  Faculty Of Integrated Arts And Sciences

• 青木 勇

  首都大 理工

• Hosoya Takaaki

  Department Of Chemistry And Materials Science Tokyo Institute Of Technology

• Kuwahara Keitaro

  Institute Of Applied Beam Science Ibaraki University

• Higashinaka Ryuji

  Department Of Physics Kyoto University

• Ueda Makoto

  Department Of Applied Physics Faculty Of Engineering Nagoya University

• Sato Hideyuki

  Department Of Applied Chemistry Faculty Of Science And Technology Keio University

• Aoki Yuji

  Graduate School Of Science Tokyo Metropolitan University

• Namiki Takahiro

  Department Of Electrical And Electronical Engineering Muroran Institute Of Technology

• Saito Takashi

  Department Of Agronomy Faculty Of Agriculture Tohoku University

• Kuwahara Keitaro

  Institute of Applied Beam Science, Ibaraki University, Mito 310-8512, Japan

• Utsumi Yoshihiro

  Institute of Applied Beam Science, Ibaraki University, Mito 310-8512, Japan

• AOKI Yuji

  Department of Physics, Faculty of Science, Tokyo Metropolitan University

• Tatsuoka Sho

  Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan

• Namiki Takahiro

  Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan

• Namiki Takahiro

  Department of Electrical and Electronic Engineering, Muroran Institute of Technology, Muroran, Hokkaido 050-8585, Japan

• Aoki Yuji

  Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan

• Aoki Yuji

  Graduate School of Science, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan

• Hosoya Takaaki

  Department of Biomolecular Functional Engineering, Ibaraki University, Hitachi, Ibaraki 316-8511, Japan

• Ueda Makoto

  Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan

• Saito Takashi

  Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan

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