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We report on specific heat, magnetic susceptibility and resistivitymeasurements on the compound Ce_(1-x)La_xNi_9Ge_4 for various concentrationsranging from the stoichiometric system with x=0 to the dilute limit x=0.95. Ourdata reveal single-ion scaling with the Ce-concentration and the largest everrecorded value of the electronic specific heat c/T approximately 5.5 JK^(-2)mol^(-1) at T=0.08K for the stoichiometric compound x=0 without any traceof magnetic order. While in the doped samples c/T increases logarithmicallybelow 3K down to 50mK, their magnetic susceptibility behaves Fermi liquid likebelow 1K. These properties make the compound Ce_(1-x)La_xNi_9Ge_4 a uniquesystem on the borderline between Fermi liquid and non-Fermi liquid physics.Comment: 4 pages, 5 figures; v2 contains additional resisitivity measurements;  final version to appear in Phys. Rev. Let

physical review letters

Unusual Single-Ion Non-Fermi-Liquid Behavior in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:mi mathvariant="normal">e</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">L</mml:mi><mml:mi mathvariant="normal">a</mml:mi></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="…

Unusual Single-Ion Non-Fermi-Liquid Behavior inCe1−xLax