Superconducting Nb-film LC resonator

Leif Grönberg, Ilkka Suni, A. Finne, R. Blaauwgeers, V. Eltsov, G. Eska, J. Ruohio, R. Schanen, M. Krusius

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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 Q∝T−0.5 and reaches ∼103 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 SiO2 insulation layer, since the thin-film coil alone reaches a Q≳105 at 0.05 K.
    Original languageEnglish
    Pages (from-to)3682-3686
    Number of pages5
    JournalReview of Scientific Instruments
    Volume72
    Issue number9
    DOIs
    Publication statusPublished - 2001
    MoE publication typeA1 Journal article-refereed

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    Grönberg, L., Suni, I., Finne, A., Blaauwgeers, R., Eltsov, V., Eska, G., Ruohio, J., Schanen, R., & Krusius, M. (2001). Superconducting Nb-film LC resonator. Review of Scientific Instruments, 72(9), 3682-3686. https://doi.org/10.1063/1.1394179