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- W167959997 abstract "The microwave properties of Ca-doped YBaCuO (YBCO) thin films $(350phantom{rule{0.3em}{0ex}}mathrm{nm}ensuremath{leqslant}tensuremath{leqslant}400phantom{rule{0.3em}{0ex}}mathrm{nm})$ have been investigated, using 30% Ca-substituted YBCO $({mathrm{Y}}_{0.7}{mathrm{Ca}}_{0.3}{mathrm{Ba}}_{2}{mathrm{Cu}}_{3}{mathrm{O}}_{7ensuremath{-}ensuremath{delta}})$ surface layers, as such layers have been shown to enhance the critical-current density of films with high-angle grain boundaries for dc and low-frequency currents. This study is an extension to the microwave range, with the aim of obtaining conditions that improve the transport properties of high-temperature superconductors. The effect of the substitution was observed to be dependent on the thickness of the overlayer. A small but significant improvement in the nonlinear part of the surface impedance $({Z}_{s})$ and intermodulation distortion (IMD) was observed for a sample with a 20-nm-thick ${mathrm{Y}}_{0.7}{mathrm{Ca}}_{0.3}{mathrm{Ba}}_{2}{mathrm{Cu}}_{3}{mathrm{O}}_{7ensuremath{-}ensuremath{delta}}$ surface layer. These results indicate that some potential exists to improve the nonlinear microwave properties by Ca substitution. On the other hand, samples with a $40ensuremath{-}mathrm{nm}ensuremath{-}mathrm{thick}$ ${mathrm{Y}}_{0.7}{mathrm{Ca}}_{0.3}{mathrm{Ba}}_{2}{mathrm{Cu}}_{3}{mathrm{O}}_{7ensuremath{-}ensuremath{delta}}$ surface layer exhibit a degradation of their microwave properties. The possible causes of improvement and degradation are presented in view of the deposition procedure and the oxygen content of the films." @default.
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- W167959997 date "2005-09-14" @default.
- W167959997 modified "2023-10-16" @default.
- W167959997 title "Linear and nonlinear microwave properties of Ca-dopedYBa2Cu3O7−δthin films" @default.
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- W167959997 doi "https://doi.org/10.1103/physrevb.72.104511" @default.
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