Dresden 2009 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 5: Postersession Superconductivity: Materials - Fabrication and Properties
TT 5.10: Poster
Monday, March 23, 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.