Regensburg 2002 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 17: Postersitzung II: Mesoskopische Systeme (1-19), Supraleiter: Theorie (20-26), Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter (27-33), Schwere Fermionen, Kondo-Systeme (34-45)

TT 17.38: Poster

Mittwoch, 13. März 2002, 14:30–18:00, A

Thermopower and thermal conductivity of YbRh₂Si₂ — •Adriana Sanchez, Christoph Geibel, Silke Paschen, Hung Tran, Octavio Trovarelli, and Frank Steglich — MPI für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, D - 01187 Dresden

YbRh₂Si₂ is identified to be one of the few stoichiometric and the first Yb-based heavy fermion compound showing non-Fermi-liquid (NFL) effects at ambient pressure. We present thermopower S and thermal conductivity κ measurements on single crystal of YbRh₂Si₂ between 100 mK and room temperature. One aim of this study is to check the predictions of a model proposed by Kotliar et al., which uses the coupled two – dimensional spin – three dimensional fermion model to study the thermoelectric behavior of a heavy – fermion compounds close to an antiferromagnetic quantum critical point. The model predicts an anomalous logarithmic temperature dependence in the thermopower, which has already been observed in CeCu_6−xAu_x.