title: 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 Deltac/T approximately 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 Deltac/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 Ce(1-x)LaxNi9Ge4 a unique system on the borderline between Fermi-liquid and non-Fermi-liquid physics.
authors.affiliation: CPM, Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany.
authors.forename: U
authors.initials: U
authors.lastname: Killer
authors.forename: E-W
authors.initials: EW
authors.lastname: Scheidt
authors.forename: G
authors.initials: G
authors.lastname: Eickerling
authors.forename: H
authors.initials: H
authors.lastname: Michor
authors.forename: J
authors.initials: J
authors.lastname: Sereni
authors.forename: Th
authors.initials: T
authors.lastname: Pruschke
authors.forename: S
authors.initials: S
authors.lastname: Kehrein