New Heavy-Electron System Ce₃Pd₂₀Si₆

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Magnetic and transport properties of the ternary compoundCe₃Pd₂₀Si₆ are investigated down to 0.035, K.The temperature dependence of the electrical resistivity indicatesthat this compound is a new Kondo material. Thelow-temperature specific heat measurement reveals that C/T is strongly enhancedat low temperatures, reaching as high as 8 , J/mole , Ce · K² at 0.2 , K.This leads to the conclusion that Ce₃Pd₂₀Si₆ is one ofthe heaviest-electron systems.