Kinetic Inductance and nonlinearity of MgB2 Films at 4K
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http://dataverse.jpl.nasa.gov/citation?persistentId=doi:10.48577/jpl.CNGTA6
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We report on the fabrication and characterization of superconducting magnesium diboride (MgB2) devices tailored for nonlinear kinetic inductance (NLKI) applications like parametric amplifiers. Leveraging the high superconducting transition temperature of MgB2 our work aims to enable either elevated operating temperatures or expanded upper- frequency limits. We have fabricated microwave resonators using ≈ 40 nm thick MgB2 films with a measured kinetic inductance per square of 5 - 7pH/□, internal quality factors, Qi ≈ 3 × 104 at 4.2 K. We measure the NLKI in MgB2 by applying a DC bias to a 6 cm long by 3 μm wide Coplanar Waveguide (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. We approximate the characteristic non-linear current parameter, I∗, for multiple CPW geometries using these measurements.
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Root
创建时间：
2025-01-12
