Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 62: Superconductivity: Properties, Electronic Structure, Order Parameter
TT 62.3: Vortrag
Donnerstag, 14. März 2013, 15:30–15:45, H19
Direct observation of the superconducting gap in thin films of titanium nitride using terahertz spectroscopy — •Uwe Santiago Pracht1, Marc Scheffler1, Martin Dressel1, Tatyana Baturina2, David Kalok3, and Christoph Strunk3 — 11. Physikalisches Institut, University of Stuttgart, Germany — 2A. V. Rzhanov Institute of Semiconductor Physics SB RAS, Russia — 3Institute of Experimental and Applied Physics, University of Regensburg, Germany
Thin films of superconducting titantium nitride (TiN) have recently gained attention for both applications (such as single-photon detectors) and fundamental reseach (as model system for the superconductor-insulator transition which is accompanied by uncommon superconducting properties). TiN has been studied comprehensively with (magneto-)transport studies, but only little is known about it’s electrodynamical properties.
We report on the charge carrier dynamics of TiN thin films with critical temperatures of 3.4 K and below, which we study with THz spectroscopy in the frequency range 90-510 GHz. Our analysis provides access to superconducting properties like the real and imaginary parts of the complex conductivity, energy gap and penetration depth. These findings as well as the normal-state properties strongly suggest conventional weak-coupling BCS superconductivity [1].
[1] U. S. Pracht et al. Phys. Rev. B 86, 184503 (2012)