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- W3204755371 abstract "We investigate how a combination of a nonmagnetic-impurity scattering rate $gamma$ and finite subgap states parametrized by Dynes $Gamma$ affects various physical quantities relevant to to superconducting devices: kinetic inductance $L_k$, complex conductivity $sigma$, surface resistance $R_s$, quality factor $Q$, and depairing current density $J_d$. All the calculations are based on the Eilenberger formalism of the BCS theory. We assume the device materials are extreme type-II $s$-wave superconductors. It is well known that the optimum impurity concentration ($gamma/Delta_0 sim 1$) minimizes $R_s$. Here, $Delta_0$ is the pair potential for the idealized ($Gammato 0$) superconductor for the temperature $Tto 0$. We find the optimum $Gamma$ can also reduce $R_s$ by one order of magnitude for a clean superconductor ($gamma/Delta_0 < 1$) and a few tens $%$ for a dirty superconductor ($gamma/Delta_0 > 1$). Also, we find a nearly-ideal ($Gamma/Delta_0 ll 1$) clean-limit superconductor exhibits a frequency-independent $R_s$ for a broad range of frequency $omega$, which can significantly improve $Q$ of a very compact cavity with a few tens of GHz frequency. As $Gamma$ or $gamma$ increases, the plateau disappears, and $R_s$ obeys the $omega^2$ dependence. The subgap-state-induced residual surface resistance $R_{rm res}$ is also studied, which can be detected by an SRF-grade high-$Q$ 3D resonator. We calculate $L_k(gamma, Gamma,T)$ and $J_d(gamma, Gamma,T)$, which are monotonic increasing and decreasing functions of $(gamma, Gamma,T)$, respectively. Measurements of $(gamma, Gamma)$ of device materials can give helpful information on engineering $(gamma, Gamma)$ via materials processing, by which it would be possible to improve $Q$, engineer $L_k$, and ameliorate $J_d$." @default.
- W3204755371 created "2021-10-11" @default.
- W3204755371 creator A5036611486 @default.
- W3204755371 date "2022-01-14" @default.
- W3204755371 modified "2023-09-30" @default.
- W3204755371 title "Effects of Nonmagnetic Impurities and Subgap States on the Kinetic Inductance, Complex Conductivity, Quality Factor, and Depairing Current Density" @default.
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- W3204755371 doi "https://doi.org/10.1103/physrevapplied.17.014018" @default.
- W3204755371 hasPublicationYear "2022" @default.
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