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TT: Fachverband Tiefe Temperaturen
TT 44: Poster Session Correlated Electrons
TT 44.30: Poster
Thursday, March 17, 2011, 10:00–13:00, P1
Field and concentration dependent scaling behavior of the thermal expansion near the quantum critical point of CeCu6−xAux — •Sebastian Zaum1,2, Kai Grube1, Roland Schäfer1, Veronika Fritsch2, Thomas Wolf1, Peter Schweiss1, and Hilbert von Löhneysen1,2 — 1Karlsruher Institut für Technologie, Institut für Festkörperphysik, 76021 Karlsruhe, Germany — 2Karlsruher Institut für Technologie, Physikalisches Institut, 76128 Karlsruhe, Germany
The heavy-fermion system CeCu6−xAux exhibits long-range antiferromagnetic order at x > 0.1. The order can be suppressed by hydrostatic or chemical pressure, through the variation of the Au content, as well as by the application of a magnetic field. The quantum critical point at the onset of antiferromagnetism leads to non-Fermi liquid behavior visible in thermodynamic and transport properties. Among these, the thermal expansion offers a particularly sensitive probe to study the quantum critical scaling behavior due to the strong pressure dependence of the Kondo effect in heavy-fermion materials. To shed light on the difference between the two control parameters, pressure and magnetic field, we studied the scaling behavior of the thermal expansion on CeCu6−xAux single crystals with varying Au content as a function of the magnetic field in the temperature range between 40 mK and 10 K.