Unusual Single-Ion Non-Fermi-Liquid Behavior in Ce1xLaxNi9Ge4

U. Killer, E.-W. Scheidt, G. Eickerling, H. Michor, J. Sereni, Th. Pruschke, and S. Kehrein
Phys. Rev. Lett. 93, 216404 – Published 16 November 2004

Abstract

We report on specific heat, magnetic susceptibility, and resistivity measurements on the compound Ce1xLaxNi9Ge4 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/T5.5JK2mol1 at T=0.08K 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 Ce1xLaxNi9Ge4 a unique system on the borderline between Fermi-liquid and non-Fermi-liquid physics.

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  • Received 19 February 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.216404

©2004 American Physical Society

Authors & Affiliations

U. Killer1, E.-W. Scheidt1, G. Eickerling1, H. Michor2, J. Sereni3, Th. Pruschke4, and S. Kehrein5

  • 1CPM, Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany
  • 2Institut für Festkörperphysik, TU Wien, 1040 Wien, Austria
  • 3Centro Atomico Bariloche, 8400 San Carlos de Bariloche, Argentina
  • 4Institut für Theoretische Physik, Universität Göttingen, 37077 Göttingen, Germany
  • 5TP III–EKM, Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany

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Issue

Vol. 93, Iss. 21 — 19 November 2004

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