Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 51, Issue 46, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/aae2fa
Keywords
microwave resonators; coplanar resonators; superconducting resonators; microwave spectroscopy; superconductivity; Mattis-Bardeen electrodynamics
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [SCHE 1580/2, SFB/TRR 21]
- COST action NANOCOHYBRI [CA16218]
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We demonstrate the operation of superconducting coplanar microwave resonators in a very large frequency range up to 50 GHz. The resonators are fabricated from niobium thin films on sapphire substrates and have fundamental frequencies of 5 GHz or 10 GHz. We study numerous harmonics of the resonators at temperatures between 1.5 K and 6 K, and we determine quality factors of up to 22 600 at 1.5 K. As an example for spectroscopy applications of such resonators we detect the superconducting transition of a bulk tin sample at multiple probing frequencies.
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