We present a systematic analysis of the internal losses of superconducting coplanar waveguide microwave resonators based on niobium thin films on silicon substrates. In particular, we investigate losses introduced by Nb/Al interfaces in the center conductor, which is important for experiments where Al based Josephson junctions are integrated into Nb based circuits. We find that these interfaces can be a strong source for two-level state (TLS) losses, when the interfaces are not positioned at current nodes of the resonator. In addition to TLS losses, for resonators including Al, quasiparticle losses become relevant above 200 mK. Finally, we investigate how losses generated by eddy currents in conductive material on the backside of the substrate can be minimized by using thick enough substrates or metals with high conductivity on the substrate backside.
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7 January 2016
Research Article|
January 05 2016
Loss mechanisms in superconducting thin film microwave resonators
Jan Goetz
;
Jan Goetz
a)
1
Walther-Meißner-Institut
, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
2Physik-Department,
Technische Universität München
, 85748 Garching, Germany
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Frank Deppe;
Frank Deppe
1
Walther-Meißner-Institut
, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
2Physik-Department,
Technische Universität München
, 85748 Garching, Germany
3
Nanosystems Initiative Munich (NIM)
, Schellingstraße 4, 80799 München, Germany
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Max Haeberlein;
Max Haeberlein
1
Walther-Meißner-Institut
, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
2Physik-Department,
Technische Universität München
, 85748 Garching, Germany
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Friedrich Wulschner;
Friedrich Wulschner
1
Walther-Meißner-Institut
, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
2Physik-Department,
Technische Universität München
, 85748 Garching, Germany
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Christoph W. Zollitsch;
Christoph W. Zollitsch
1
Walther-Meißner-Institut
, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
2Physik-Department,
Technische Universität München
, 85748 Garching, Germany
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Sebastian Meier
;
Sebastian Meier
1
Walther-Meißner-Institut
, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
2Physik-Department,
Technische Universität München
, 85748 Garching, Germany
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Michael Fischer;
Michael Fischer
1
Walther-Meißner-Institut
, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
2Physik-Department,
Technische Universität München
, 85748 Garching, Germany
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Peter Eder;
Peter Eder
1
Walther-Meißner-Institut
, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
2Physik-Department,
Technische Universität München
, 85748 Garching, Germany
3
Nanosystems Initiative Munich (NIM)
, Schellingstraße 4, 80799 München, Germany
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Edwar Xie;
Edwar Xie
1
Walther-Meißner-Institut
, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
2Physik-Department,
Technische Universität München
, 85748 Garching, Germany
3
Nanosystems Initiative Munich (NIM)
, Schellingstraße 4, 80799 München, Germany
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Kirill G. Fedorov;
Kirill G. Fedorov
1
Walther-Meißner-Institut
, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
2Physik-Department,
Technische Universität München
, 85748 Garching, Germany
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Edwin P. Menzel;
Edwin P. Menzel
1
Walther-Meißner-Institut
, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
2Physik-Department,
Technische Universität München
, 85748 Garching, Germany
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Achim Marx;
Achim Marx
1
Walther-Meißner-Institut
, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
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Rudolf Gross
Rudolf Gross
b)
1
Walther-Meißner-Institut
, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
2Physik-Department,
Technische Universität München
, 85748 Garching, Germany
3
Nanosystems Initiative Munich (NIM)
, Schellingstraße 4, 80799 München, Germany
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J. Appl. Phys. 119, 015304 (2016)
Article history
Received:
October 20 2015
Accepted:
December 20 2015
Citation
Jan Goetz, Frank Deppe, Max Haeberlein, Friedrich Wulschner, Christoph W. Zollitsch, Sebastian Meier, Michael Fischer, Peter Eder, Edwar Xie, Kirill G. Fedorov, Edwin P. Menzel, Achim Marx, Rudolf Gross; Loss mechanisms in superconducting thin film microwave resonators. J. Appl. Phys. 7 January 2016; 119 (1): 015304. https://doi.org/10.1063/1.4939299
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