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- W2950114248 abstract "We have investigated the nonlinear microwave properties of electron-beam coevaporated YBaCuO films on MgO, using stripline resonators at 2.3 GHz and temperatures 1.7-80 K. The oxygen content of the films ranged from strongly underdoped to overdoped. Above 20 K, the nonlinear response of the resonators was dominated by the superconductor. We could establish clear correlations between the nonlinear surface resistance, two-tone intermodulation (IMD), and oxygen content of the films, which indicate that the superconducting order parameter is important for the nonlinearities. An exponential rather than a power-law representation of the nonlinear current-voltage relation would be required to explain our results phenomenologically. Below 20 K, the dielectric loss tangent of MgO dominated the nonlinear response of the resonators. With increasing power, the dissipation losses decreased markedly, accompanied by enhanced IMD. The surface reactance passed through a shallow minimum at about 5 K, independent of power. We attribute these effects to resonant absorption by impurity states in MgO." @default.
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- W2950114248 date "2002-08-14" @default.
- W2950114248 modified "2023-10-16" @default.
- W2950114248 title "Nonlinear microwave response of epitaxial YBaCuO films of varying oxygen content on MgO substrates" @default.
- W2950114248 cites W1562673601 @default.
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- W2950114248 doi "https://doi.org/10.48550/arxiv.cond-mat/0208285" @default.
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