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Verhandlungen der Deutschen Physikalischen Gesellschaft

Magnetic field dependent microwave spectroscopy on superconducting Pb stripline resonators

Nikolaj G. Ebensperger, Markus Thiemann, Martin Dressel, Marc Scheffler

Published Jan 1, 2016• 0 citations
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Interplay of coupling, residual, and quasiparticle losses for the frequency- and temperature-dependent quality factor of superconducting resonators

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Abstract The overall, loaded quality factor Q L quantifies the loss of energy stored in a resonator. Here we discuss on general grounds how Q L of a planar microwave resonator made of a conventional superconductor should depend on temperature and frequency. We consider contributions to Q L due to dissipation by thermal quasiparticles ( Q QP ), due to residual dissipation ( Q Res ), and due to coupling ( Q C ). We present experimental data obtained with superconducting stripline resonators fabricated from lead (Pb), with different center conductor widths and different coupling gaps. We probe the resonators at various harmonics between 0.7 GHz and 6 GHz and at temperatures between 1.5 K and 7 K. We find a strongly frequency- and temperature-dependent Q L , which we can describe by a lumped-element model. For certain resonators at lowest temperatures we observe a maximum in the frequency-dependent Q L when Q Res and Q C match, and here the measured Q L can exceed 2 × 10 5 .

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Precise Characterization of Superconducting Microwave Resonators

Otto Solatie

•Dec 11, 2019•0 citations
Planar superconducting microwave resonators are commonly operated for various cryogenic applications, typically at frequencies between 2 and 15 GHz. But for certain applications, e.g. microwave spectroscopy to study the dynamics of charges and spins in solids, a wider spectral range is desired. Driving such microwave resonators at higher frequencies is challenging due to enhanced losses and reduced wavelength. Here we present superconducting stripline resonators operating at multiple frequencies as high as 50 GHz. These resonators are fabricated of Pb and can easily be adjusted to particular applications, including mK temperatures in a dilution refrigerator. Demonstrating such a resonator as a spectroscopic tool, we detect the superconducting transition of a Sn sample in a wide spectral range.
We have studied the power dependence of the microwave-induced dc voltages across "unbiased" Pb---Pb oxide---Pb Josephson tunnel junctions and found a systematic dependence. We have also found that the Josephson effect in the form of induced quantum voltages was observable in a large dc magnetic field as high as 0.5 kG, about one-half of the Hc2{H}_{c2}Hc2​ of the superconducting Pb film.
Abstract The overall, loaded quality factor Q L quantifies the loss of energy stored in a resonator. Here we discuss on general grounds how Q L of a planar microwave resonator made of a conventional superconductor should depend on temperature and frequency. We consider contributions to Q L due to dissipation by thermal quasiparticles ( Q QP ), due to residual dissipation ( Q Res ), and due to coupling ( Q C ). We present experimental data obtained with superconducting stripline resonators fabricated from lead (Pb), with different center conductor widths and different coupling gaps. We probe the resonators at various harmonics between 0.7 GHz and 6 GHz and at temperatures between 1.5 K and 7 K. We find a strongly frequency- and temperature-dependent Q L , which we can describe by a lumped-element model. For certain resonators at lowest temperatures we observe a maximum in the frequency-dependent Q L when Q Res and Q C match, and here the measured Q L can exceed 2 × 10 5 .