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U. Killer, E. Scheidt, G. Eickerling, H. Michor, J.G. Sereni, Th. Pruschke, S. Kehrein:
"Unusual Single-Ion Non-Fermi-Liquid Behavior in Ce_1-xLa_xNi₉Ge₄";
Physical Review Letters, Vol. 93 (2004), No. 21; S. 216404-1 - 216404-4.

Unusual Single-Ion Non-Fermi-Liquid Behavior in Ce1-xLaxNi9Ge4

U. Killer,1 E.-W. Scheidt,1 G. Eickerling,1 H. Michor,2 J. Sereni,3 Th. Pruschke,4 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

(Received 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 Deltac/T[approximate]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 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/abstract/PRL/v93/e216404

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04970169

http://link.aps.org/doi/10.1103/PhysRevLett.93.216404