Low-Temperature Magnetic Properties of Several Compounds in Ce-Pd-X (X=Si, Ge and Al) Ternary Systems.

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  • Kitagawa Jiro
    Institute for Solid State Physics, University of Tokyo, Roppongi, Minato–ku, Tokyo 106
  • Muro Yuji
    Institute for Solid State Physics, University of Tokyo, Roppongi, Minato–ku, Tokyo 106
  • Takeda Naoya
    Institute for Solid State Physics, University of Tokyo, Roppongi, Minato–ku, Tokyo 106
  • Ishikawa Masayasu
    Institute for Solid State Physics, University of Tokyo, Roppongi, Minato–ku, Tokyo 106

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  • Low-Temperature Magnetic Properties of

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Abstract

We have investigated several ternary compounds of cerium in the Ce-Pd-X (X=Si, Ge and Al) systems and their La counterparts by measuring the magnetic susceptibility, electrical resistivity and specific heat. The Ce ions in these compounds are in the nearly trivalent state and most of them show magnetic order of either long-range or spin-glass type at low temperatures. None of them distinctly exhibits the heavy fermion behavior, although it may be obscured by atomic disorder in some compounds. The relation between several isostructural ternary compounds of Ce-Pd-(Si and Ge) or Ce-Pd-(Al and Ga) system is qualitatively discussed in the framework of the Doniach phase diagram. The variation of the unit cell volume suggests that the former group is consistent with this phase diagram but the latter is not seemingly so. We found that LaPdSi3 and LaPd0.6Ge1.4 among the La counterparts are superconducting below 2.6 and 2.8 K, respectively.

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