Limitations in the microwave stimulation of superconductivity
G. BevzaPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovI. M. DmitrenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovV. I. KaramushkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovO. G. TurutanovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kov
ABI
Abstract
A limitation of the stimulation of superconductivity is observed in measurements of critical current as a function of the incident microwave power in narrow long films of tin, with a sudden fall of the critical current to zero at a certain critical radiation power. This limitation is due to the occurrence of a spatially nonuniform state, the existence of which in the film is confirmed by the form of the current-voltage characteristics. A numerical calculation carried out using Eliashberg’s theory, taking into account the heating due to the microwave field, does not agree with the thermal mechanism of the limitation of stimulation.
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