Josephson Oscillators Based on Amorphous Superconductors

Ivan Petrovich Nevirkovets; J. B. Ketterson

doi:10.1109/TASC.2023.3242214

Josephson Oscillators Based on Amorphous Superconductors

Ivan Petrovich Nevirkovets^*, J. B. Ketterson

^*Corresponding author for this work

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

Thin films of amorphous MoxGe1-x grown with magnetron sputtering are known to exhibit excellent homogeneity and fairly high superconducting transition temperatures (up to 7.5 K). These properties make MoGe thin films suitable to form high-quality tunnel junctions, as demonstrated recently by our group [see Supercond. Sci. Technol. 35, 035008 (2022)]. Here, we report the experimental demonstration of an MoGe/Al/AlOx/(Al)MoGe Josephson oscillator based on amorphous superconductor MoGe, which allows for continuous tuning of the oscillation frequency from about 1 GHz up to tens of GHz. We believe such an oscillator may be useful as a compact on-chip microwave source suitable to control some types of qubits based on Josephson junctions.

Original language	English (US)
Article number	1100405
Journal	IEEE Transactions on Applied Superconductivity
Volume	33
Issue number	5
DOIs	https://doi.org/10.1109/TASC.2023.3242214
State	Published - Aug 1 2023

Keywords

Josephson junctions
SIS devices
flux-flow oscillators
superconducting microwave devices

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1109/TASC.2023.3242214

Cite this

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title = "Josephson Oscillators Based on Amorphous Superconductors",

abstract = "Thin films of amorphous MoxGe1-x grown with magnetron sputtering are known to exhibit excellent homogeneity and fairly high superconducting transition temperatures (up to 7.5 K). These properties make MoGe thin films suitable to form high-quality tunnel junctions, as demonstrated recently by our group [see Supercond. Sci. Technol. 35, 035008 (2022)]. Here, we report the experimental demonstration of an MoGe/Al/AlOx/(Al)MoGe Josephson oscillator based on amorphous superconductor MoGe, which allows for continuous tuning of the oscillation frequency from about 1 GHz up to tens of GHz. We believe such an oscillator may be useful as a compact on-chip microwave source suitable to control some types of qubits based on Josephson junctions.",

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T1 - Josephson Oscillators Based on Amorphous Superconductors

AU - Nevirkovets, Ivan Petrovich

AU - Ketterson, J. B.

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N2 - Thin films of amorphous MoxGe1-x grown with magnetron sputtering are known to exhibit excellent homogeneity and fairly high superconducting transition temperatures (up to 7.5 K). These properties make MoGe thin films suitable to form high-quality tunnel junctions, as demonstrated recently by our group [see Supercond. Sci. Technol. 35, 035008 (2022)]. Here, we report the experimental demonstration of an MoGe/Al/AlOx/(Al)MoGe Josephson oscillator based on amorphous superconductor MoGe, which allows for continuous tuning of the oscillation frequency from about 1 GHz up to tens of GHz. We believe such an oscillator may be useful as a compact on-chip microwave source suitable to control some types of qubits based on Josephson junctions.

AB - Thin films of amorphous MoxGe1-x grown with magnetron sputtering are known to exhibit excellent homogeneity and fairly high superconducting transition temperatures (up to 7.5 K). These properties make MoGe thin films suitable to form high-quality tunnel junctions, as demonstrated recently by our group [see Supercond. Sci. Technol. 35, 035008 (2022)]. Here, we report the experimental demonstration of an MoGe/Al/AlOx/(Al)MoGe Josephson oscillator based on amorphous superconductor MoGe, which allows for continuous tuning of the oscillation frequency from about 1 GHz up to tens of GHz. We believe such an oscillator may be useful as a compact on-chip microwave source suitable to control some types of qubits based on Josephson junctions.

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KW - SIS devices

KW - flux-flow oscillators

KW - superconducting microwave devices

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Josephson Oscillators Based on Amorphous Superconductors

Abstract

Keywords

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