Pressure Effect on the Specific Heat of CeNi Single Crystal.

  • Takayanagi Shigeru
    Physics Department, Hokkaido University of Education, Sapporo, Sapporo 002-8502
  • Araki Shingo
    Faculty of Science, Osaka University, Toyonaka, Osaka 560-0043
  • Settai Rikio
    Faculty of Science, Osaka University, Toyonaka, Osaka 560-0043
  • Onuki Yoshichika
    Faculty of Science, Osaka University, Toyonaka, Osaka 560-0043
  • Mori Nobuo
    Institute of Solid State Physics, University of Tokyo, Roppongi, Tokyo 106-8666

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We have studied the pressure dependence of the specific heat in a CeNi single crystal using a clamp-type pressure-cell up to 0.8 GPa. The pressure dependence of the electronic specific heat coefficient is found to exhibit a sharp drop at 0.3-0.4 GPa. The present result indicates the instability of a mixed valence state of 4f electrons.

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