Superconducting Nb-film LC resonator

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

doi:10.1063/1.1394179

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 SiO₂insulation layer, since the thin-film coil alone reaches a Q≳10⁵at 0.05 K.

Original language	English
Pages (from-to)	3682-3686
Number of pages	5
Journal	Review of Scientific Instruments
Volume	72
Issue number	9
DOIs	https://doi.org/10.1063/1.1394179
Publication status	Published - 2001
MoE publication type	A1 Journal article-refereed

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10.1063/1.1394179

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title = "Superconducting Nb-film LC resonator",

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.",

author = "Leif Gr{\"o}nberg and Ilkka Suni and A. Finne and R. Blaauwgeers and V. Eltsov and G. Eska and J. Ruohio and R. Schanen and M. Krusius",

note = "Project code: SQUID 2000",

year = "2001",

doi = "10.1063/1.1394179",

language = "English",

volume = "72",

pages = "3682--3686",

journal = "Review of Scientific Instruments",

issn = "0034-6748",

publisher = "American Institute of Physics (AIP)",

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TY - JOUR

T1 - Superconducting Nb-film LC resonator

AU - Grönberg, Leif

AU - Suni, Ilkka

AU - Finne, A.

AU - Blaauwgeers, R.

AU - Eltsov, V.

AU - Eska, G.

AU - Ruohio, J.

AU - Schanen, R.

AU - Krusius, M.

N1 - Project code: SQUID 2000

PY - 2001

Y1 - 2001

N2 - 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.

AB - 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.

U2 - 10.1063/1.1394179

DO - 10.1063/1.1394179

M3 - Article

SN - 0034-6748

VL - 72

SP - 3682

EP - 3686

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 9

ER -

Superconducting Nb-film LC resonator

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