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TT: Fachverband Tiefe Temperaturen
TT 24: SC: Properties, Electronic Structure, Mechanisms
TT 24.12: Vortrag
Mittwoch, 24. März 2010, 17:30–17:45, H19
Optical conductivity of LuNi2B2C in the terahertz range — •T. Fischer1, A. V. Pronin1, J. Wosnitza1, T. Niemeier2, and B. Holzapfel2 — 1Hochfeld-Magnetlabor Dresden (HLD), FZ Dresden-Rossendorf, 01314 Dresden, Germany — 2Leibniz-Institut für Festkörper- und Werkstoffforschung, 01171 Dresden, Germany
Using a backward-wave-oscillator-based setup in a Mach-Zehnder interferometer arrangement, we have measured the temperature- and frequency-dependent transmission and phase-shift spectra of LuNi2B2C films on MgO substrates in the range 200 GHz - 1.4 THz. From the measured spectra, we have directly calculated the complex optical conductivity. We observe a clear signature of the superconducting energy gap in the spectra. In the talk, a comparison of the experimentally obtained spectra with theoretical predictions for a multi-band superconductor will be given.