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TT: Fachverband Tiefe Temperaturen

TT 5: Postersession Superconductivity: Materials - Fabrication and Properties

TT 5.10: Poster

Montag, 23. März 2009, 13:00–16:45, P1A

Deviations from the conventional BCS behavior in the penetration depth of lutetium-nickel-borocarbide films at terahertz frequencies — •T. Fischer¹, A. V. Pronin¹, J. Wosnitza¹, T. Niemeier², and B. Holzapfel² — ¹Hochfeld-Magnetlabor Dresden (HLD), FZ Dresden-Rossendorf, 01314 Dresden, Germany — ²IFW Dresden, 01171 Dresden, Germany

We have measured the temperature and frequency-dependant transmission and phase shift through LuNi₂B₂C thin films on MgO substrates at terahertz frequencies. From the measured data, we could accurately determine the complex dielectric constant, є, the complex optical conductivity, σ, and the penetration depth, λ. Comparing our measured results with theory, we find strong deviations from the standard one-band BCS predictions. These deviations can be attributed to the multiband nature of the superconducting state in LuNi₂B₂C.