Abstract
Nonlinear phenomena in superconducting niobium microstrip-like resonators filled by liquid helium are studied in microwaves. The found nonlinear resonance is explained by thermally induced variations of the helium dielectric permittivity caused by the microwave power losses in superconductor. A number of interesting manifestations of this thermal instability have been observed including the parametric pulse generation of the monochromatic microwave signal, generation of acoustic pulses.
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