We report on the fabrication and characterization of superconducting magnesium diboride (MgB2) thin films intended for quantum-limited devices based on non-linear kinetic inductance (NLKI) such as parametric amplifiers with either elevated operating temperatures or expanded frequency ranges. In order to characterize the MgB2 material properties, we have fabricated coplanar waveguide (CPW) transmission lines and microwave resonators using 40 nm thick MgB2 films with a measured kinetic inductance of 5.5 pH/ and internal quality factors at 4.2 K. We measure the NLKI in MgB2 by applying a DC bias to a 6 cm long by 4 μm wide CPW transmission line and measuring the resulting phase delay caused by the current dependent NLKI. We also measure the current dependent NLKI through CPW resonators that shift down in frequency with increased power applied through the CPW feedline. Using these measurements, we calculate the characteristic non-linear current parameter, , for multiple CPW geometries. We find values for corresponding current density, MA/cm2, and a ratio of the critical current to the non-linear current parameter, , similar to or higher than values for other superconductors such as NbTiN and TiN.
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Kinetic inductance and non-linearity of MgB2 films at 4K
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13 January 2025
Research Article|
January 16 2025
Kinetic inductance and non-linearity of MgB2 films at 4K
J. Greenfield
;
J. Greenfield
a)
(Formal analysis, Writing – original draft, Writing – review & editing)
1
Jet Propulsion Laboratory, California Institute of Technology
, Pasadena, California 91109, USA
2
School of Earth and Space Exploration, Arizona State University
, Tempe, Arizona 85287, USA
a)Author to whom correspondence should be addressed: [email protected]
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C. Bell
;
C. Bell
(Formal analysis, Writing – review & editing)
3
Department of Physics, Arizona State University
, Tempe, Arizona 85287, USA
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F. Faramarzi
;
F. Faramarzi
(Writing – original draft, Writing – review & editing)
1
Jet Propulsion Laboratory, California Institute of Technology
, Pasadena, California 91109, USA
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C. Kim
;
C. Kim
(Resources)
1
Jet Propulsion Laboratory, California Institute of Technology
, Pasadena, California 91109, USA
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R. Basu Thakur
;
R. Basu Thakur
(Writing – review & editing)
1
Jet Propulsion Laboratory, California Institute of Technology
, Pasadena, California 91109, USA
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A. Wandui
;
A. Wandui
(Formal analysis, Writing – review & editing)
1
Jet Propulsion Laboratory, California Institute of Technology
, Pasadena, California 91109, USA
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C. Frez;
C. Frez
(Resources)
1
Jet Propulsion Laboratory, California Institute of Technology
, Pasadena, California 91109, USA
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P. Mauskopf
;
P. Mauskopf
(Formal analysis, Resources, Writing – original draft, Writing – review & editing)
2
School of Earth and Space Exploration, Arizona State University
, Tempe, Arizona 85287, USA
3
Department of Physics, Arizona State University
, Tempe, Arizona 85287, USA
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D. Cunnane
D. Cunnane
(Formal analysis, Project administration, Resources, Supervision, Writing – original draft, Writing – review & editing)
1
Jet Propulsion Laboratory, California Institute of Technology
, Pasadena, California 91109, USA
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a)Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 126, 022602 (2025)
Article history
Received:
October 29 2024
Accepted:
December 30 2024
Citation
J. Greenfield, C. Bell, F. Faramarzi, C. Kim, R. Basu Thakur, A. Wandui, C. Frez, P. Mauskopf, D. Cunnane; Kinetic inductance and non-linearity of MgB2 films at 4K. Appl. Phys. Lett. 13 January 2025; 126 (2): 022602. https://doi.org/10.1063/5.0245866
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