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Superconducting Nb-film LC resonator

A. Finne·L. Groenberg·R. Blaauwgeers·V. B. Eltsov·G. Eska·M. Krusius·J. J. Ruohio·R. Schanen·I. Suni
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Abstract

Sputtered Nb thin-film LC resonators for low frequencies at 0.5 MHz have been fabricated and tested in the temperature range 0.05--1 K in magnetic fields up to 30 mT. Their Q value increases towards decreasing temperature as sqrt(T) and reaches 10^3 at 0.05 K. As a function of magnetic field Q is unstable and displays variations up to 50%, which are reproducible from one field sweep to the next. These instabilities are attributed to dielectric losses in the plasma deposited SiO_2 insulation layer, since the thin-film coil alone reaches a Q > 10^5 at 0.05 K.

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A. Finne, L. Groenberg, R. Blaauwgeers, V. B. Eltsov, G. Eska, M. Krusius, J. J. Ruohio, R. Schanen, I. Suni. 2000-12-21. Superconducting Nb-film LC resonator. https://doi.org/10.1063/1.1394179

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