Unusual Single-Ion Non-Fermi Liquid Behavior in Ce(1-x)LaxNi9Ge4
Abstract
We report on specific heat, magnetic susceptibility and resistivity measurements on the compound Ce(1-x)LaxNi9Ge4 for various concentrations ranging from the stoichiometric system with x=0 to the dilute limit x=0.95. Our data reveal single-ion scaling with the Ce-concentration and the largest ever recorded value of the electronic specific heat c/T approximately 5.5 J K(-2)mol(-1) at T=0.08K for the stoichiometric compound x=0 without any trace of magnetic order. While in the doped samples c/T increases logarithmically below 3K down to 50mK, their magnetic susceptibility behaves Fermi liquid like below 1K. These properties make the compound Ce(1-x)LaxNi9Ge4 a unique system on the borderline between Fermi liquid and non-Fermi liquid physics.
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