Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 25: Correlated Electrons - Poster Session
TT 25.78: Poster
Mittwoch, 29. März 2006, 14:30–18:30, P1
Quantum Critical Behavior in CeNi9−xCuxGe4. — •E. –W. Scheidt1, W. Scherer1, G. Hilscher2, and H. Michor2 — 1Chemische Physik und Materialwissenschaften, Universität Augsburg, 86159 Augsburg, Germany — 2Institut für Festkörperphysik, TU Wien, 1040
CeNi9Ge4 exhibits unusual non-Fermi liquid (nFl) behavior with the largest ever recorded value of the electronic specific heat Δ c/T ≅ 5.5 JK−2mol−1 without showing any trace of magnetic order [1]. Specific heat measurements show that the logarithmic increase of the Sommerfeld coefficient flattens off below 200 mK indicating coherent effects, whereas substitution of Ce by La in CeNi9Ge4 supports a single ion scenario as the main reason for the nFL behavior. Here we report on new substitution experiments replacing Ni by Cu. Specific heat and susceptibility results will discussed in the framework of a quantum critical phase transition scenario.
[1] U. Killer, E.-W. Scheidt, G. Eickerling, H. Michor, J. Sereni, Th. Pruschke, S. Kehrein, Phys. Rev. Lett. 92, 27003 (2004)