Origin of nonlinear surface impedance and intermodulation distortion in YBa2Cu3O7−x microstrip resonator

Abstract

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Microwave nonlinearities of an isolated longYBa2Cu3O7−δbicrystal grain boundary

“…6,7,8,9 On the other hand, extrinsic sources of nonlinearities dominate the nonlinear response of superconductors in most cases. They include grain boundaries, 10,11 enhanced edge currents, 12,13,14,15,16 and weakly coupled grains, 17,18,19,20,21,22,23,24 . A number of experiments have been conducted to understand and characterize the nonlinear properties of one of these sources by measuring artificially-prepared features, e.g.…”

Self-consistent numerical method to study nonlinearity in high-Tc superconductors using complex conductivity

“…In order to validate our self consistent method, we have compared our numerical results with three different experimental data reported in the literature [18,19]. In Ref.…”

“…In Ref. [18], Hoshizaki et al measured the quality factor and the resonance frequency for YBCO thin-film resonators deposited on MgO substrate at a temperature of 70 K (this will be referred to as sample S1). The resonator used has dimensions of 0.5 mm · 48.6 mm · 0.5 mm, a characteristic impedance Z 0 = 50 X, and a resonance frequency f 0 = 1.2 GHz.…”

“…Table 1 below. Solid line represents the calculated results whereas the squares represent the experimental data of S1 [18]. function of the microwave input power were used for comparison with our numerical data, as shown in Figs.…”

“…Good fitting of our calculated curve with the experiment is shown. Solid line represents the calculated results whereas the squares represent the experimental data of S1 [18]. Table 2 below.…”