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- W2950439306 abstract "There is a renewed interest in superconductors for high-frequency applications, leading to a reconsideration of already known low-$T_c$ and high-$T_c$ materials. In this view, we present an experimental investigation of the millimeter-wave response in moderate magnetic fields of Tl$_2$Ba$_2$CaCu$_2$O$_{8+x}$ superconducting films with the aim of identifying the mechanisms of the vortex-motion-induced response. We measure the dc magnetic-field-dependent change of the surface impedance, $Delta Z_s(H) = Delta R_s(H) + iDelta X_s(H)$ at 48 GHz by means of the dielectric resonator method. We find that the overall response is made up of several contributions, with different weights depending on the temperature and field: a possible contribution from Josephson or Abrikosov-Josephson fluxons at low fields; a seemingly conventional vortex dynamics at higher fields; a significant pair breaking in the temperature region close to $T_c$. We extract the vortex motion depinning frequency $f_p$, which attains surprisingly high values. However, by exploiting the generalized model for relaxational dynamics we show that this result come from a combination of a pinning constant $k_p$ arising from moderate pinning, and a vortex viscosity $eta$ with anomalously small values. This latter fact, implying large dissipation, is likely a result from a peculiar microscopic structure and thus poses severe limits to the application of Tl$_2$Ba$_2$CaCu$_2$O$_{8+x}$ in a magnetic field." @default.
- W2950439306 created "2019-06-27" @default.
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- W2950439306 date "2019-08-01" @default.
- W2950439306 modified "2023-10-16" @default.
- W2950439306 title "Measurements of Microwave Vortex Response in DC Magnetic Fields in Tl<inline-formula> <tex-math notation=LaTeX>$_2$</tex-math> </inline-formula>Ba<inline-formula> <tex-math notation=LaTeX>$_2$</tex-math> </inline-formula>CaCu<inline-formula> <tex-math notation=LaTeX>$_2$</tex-math> </inline-formula>O<inline-formula> <tex-math notation=LaTeX>$_{8+x}$</tex-math> </inline-formula> Films" @default.
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- W2950439306 doi "https://doi.org/10.1109/tasc.2019.2896531" @default.
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