Third-Order Magnetic Susceptibility and Quadrupolar Order Parameter of Kondo-Lattice Compound Ce<sub><b>3</b></sub>Pd<sub><b>20</b></sub>Ge<sub><b>6</b></sub>

  • Kitagawa Jiro
    Institute for Solid State Physics, University of Tokyo, Roppongi, Minato–ku, Tokyo 106–8666
  • Takeda Naoya
    Institute for Solid State Physics, University of Tokyo, Roppongi, Minato–ku, Tokyo 106–8666
  • Ishikawa Masayasu
    Institute for Solid State Physics, University of Tokyo, Roppongi, Minato–ku, Tokyo 106–8666
  • Nakayama Masahiko
    Physics Department, Graduate School of Science, Tohoku University, Sendai 980–8578
  • Kimura Noriaki
    Physics Department, Graduate School of Science, Tohoku University, Sendai 980–8578
  • Komatsubara Takemi
    Physics Department, Graduate School of Science, Tohoku University, Sendai 980–8578

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  • Third-Order Magnetic Susceptibility and Quadrupolar Order Parameter of Kondo-Lattice Compound Ce3Pd20Ge6.

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We present a report on crystalline-electric-field effects observed in the electrical resistivity and the specific heat of Ce3Pd20Ge6, which are discussed within an energy level scheme of the Γ 8 ground state and the Γ 7 excited state at 50 K for both inequivalent crystallographic sites of Ce atom. The third-order magnetic susceptibility was deduced from the magnetization measurement in the paramagnetic phase of a single-crystalline sample in magnetic fields applied along [0~0~1] and [1~1~1]. In order to explain the temperature dependence of the third-order magnetic susceptibility along [0~0~1], a positive total quadrupolar pair interaction constant of 22 mK is required in addition to a small antiferromagnetic exchange interaction, thereby suggesting ferroquadrupolar ordering with the Γ 3 symmetry in this compound.

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