Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Superconductivity: Poster Session
TT 19.5: Poster
Montag, 7. März 2016, 15:00–18:00, Poster D
Superconducting coplanar resonators with frequencies up to 50 GHz — •Markus Thiemann1, Desirée Rausch1, Martin Dressel1, Daniel Bothner2, Reinhold Kleiner2, Dieter Koelle2, and Marc Scheffler1 — 11. Physikalisches Institut, Universität Stuttgart — 2Physikalisches Institut and Center for Quantum Science in LISA+,Universität Tübingen
Planar superconducting microwave resonators are widely used, e.g. in the field of quantum information technology, but usually at frequencies well below 20 GHz. Because of their high quality factor and therefore high sensitivity, superconducting planar resonators are very interesting probes for investigating the electronic properties of novel superconductors. The energy gap of superconductors with a Tc< 1 K lies within the GHz-regime. Hence, resonators covering a wide frequency range are desirable to perform measurements across the superconducting energy gap.
Therefore we have developed coplanar resonators, made of superconducting niobium (Tc ≈ 9.2 K) on sapphire with operating frequencies up to 50 GHz. We show measurements performed on two different resonator designs with fundamental resonance frequencies of 2 GHz and 5 GHz, at 4He temperatures. By measuring not only the fundamental mode, but also the higher harmonics, frequencies up to 50 GHz can be covered, showing quality factors exceeding 20000. To demonstrate the applicability of these resonators for spectroscopic measurements, we show measurements performed on bulk tin (Tc ≈ 3.7 K), where the superconducting transition of tin can be observed up to 50 GHz.