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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.23: Poster

Donnerstag, 17. März 2011, 10:00–13:00, P1

Low-frequency optics on Sr_1−xCa_xRuO₃ — •Diana Geiger¹, Marc Scheffler¹, Martin Dressel¹, Melanie Schneider², and Philipp Gegenwart² — ¹1. Physikalisches Institut, Universität Stuttgart, Germany — ²I. Physikalisches Institut, Georg-August-Universität Göttingen, Germany

The pseudo-cubic perovskite ruthenates SrRuO₃ and CaRuO₃ have attracted interest due to their unconventional electronic properties. For both materials, non-Fermi liquid behavior has been reported in previous optical studies. In addition to these compounds, the doping series Sr_1−xCa_xRuO₃ offers a rich phase diagram: going from the itinerant ferromagnet SrRuO₃ to the paramagnet CaRuO₃, a quantum phase transition is expected at x≈0.8.

Using different approaches of optical spectroscopy, we studied thin-film samples of the Sr_1−xCa_xRuO₃ system, which were prepared by metalorganic aerosol deposition. In order to be sensitive to the low energy scales expected close to the quantum phase transition, we address the THz and GHz frequency ranges at temperatures down to 2K. We present optical data, in particular the frequency-dependent conductivity, and discuss it in the framework of the extended Drude model and possible non-Fermi liquid behavior.