Abstract
We report a detailed investigation of harmonic generation at microwave frequencies in Ba 0.6K 0.4BiO 3 crystals. Second- and third-harmonic signals are investigated as a function of temperature, external magnetic field and input power level, at temperatures close to T c. The experimental data are discussed in the framework of a phenomenological theory, based on the two-fluid model, which assumes that the microwave and the static fields, penetrating the sample within the penetration depth, perturb the partial concentrations of the normal and condensate fluids. We show that the enhanced nonlinear effects detected near T c in Ba 0.6K 0.4BiO 3 and YBa 2Cu 3O 7 crystals may have the same origin. However, in order to account for the experimental data of Ba 0.6K 0.4BiO 3, one needs to involve a distribution of T c over the crystal.
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