X-Ray Diffraction Study on Thermal Properties of Crystal Lattices in CeP and CeAs

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  • Iwasa Kazuaki
    Department of Physics, Faculty of Science, Tokyo Metropolitan University, Hachioji, Tokyo 192–0397
  • Kohgi Masahumi
    Department of Physics, Faculty of Science, Tokyo Metropolitan University, Hachioji, Tokyo 192–0397
  • Ohsumi Hiroyuki
    Department of Physics, Faculty of Science and Technology, Keio University, Yokohama 223–8522
  • Tajima Keisuke
    Department of Physics, Faculty of Science and Technology, Keio University, Yokohama 223–8522
  • Takeuchi Tetsuya
    Low Temperature Center, Osaka University, Toyonaka, Osaka 560–0043
  • Haga Yoshinori
    Advance Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319–1195
  • Uesawa Akihiro
    Department of Physics, Faculty of Science, Tohoku University, Sendai 980–8578
  • Suzuki Takashi
    Department of Physics, Faculty of Science, Tohoku University, Sendai 980–8578

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X-ray diffraction studies at low temperatures have been performed in order to investigate thermal properties of crystal lattices in the low-carrier-density systemscerium monopnictides. CeP and CeAs show large crystal-lattice contractions with increasingtemperatures up to about 120, K and 90, K, respectively. Due to the strong p-f mixing, theexcited crystal fieldΓ8-like state is expected to produce a shorter interatomic bond length betweencerium ions and neighboring pnictogens than that realized by the Γ7 ground state.The experimental results of the lattice contractions at low temperatures are explained bythe thermal average of these crystal field states.

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