Phys. Rev. Lett. 93, 216404 (2004) [4 pages]Unusual Single-Ion Non-Fermi-Liquid Behavior in Ce1-xLaxNi9Ge4Received 19 February 2004; published 16 November 2004 We report on specific heat, magnetic susceptibility, and resistivity measurements on the compound Ce1-xLaxNi9Ge4 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 Δc/T≈5.5 J K-2 mol-1 at T=0.08 K for the stoichiometric compound x=0 without any trace of magnetic order. While in the doped samples Δc/T increases logarithmically below 3 K down to 50 mK, their magnetic susceptibility behaves Fermi-liquid-like below 1 K. These properties make the compound Ce1-xLaxNi9Ge4 a unique system on the borderline between Fermi-liquid and non-Fermi-liquid physics. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.216404
DOI:
10.1103/PhysRevLett.93.216404
PACS:
71.27.+a, 71.10.Hf, 75.30.Mb, 75.40.–s
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