Synchronization of high-frequency oscillations of phase-slip centers in a tin whisker under microwave radiation
V. I. Kuznetsov, V. A. Tulin
Abstract
Current-voltage characteristics of a system with a variable number of phase-slip centers resulting from phase separation in a tin whisker under external microwave field with a frequency Ω/2π\=35-45 GHz have been studied experimentally. Emergence and disappearance of steps with zero slope in a whisker's current-voltage characteristic at Um/n=(m/n)UΩ, where m and n are integers and UΩ is determined by Josephson's formula Ω=2eUΩ, have been investigated. Microwave field generated by phase-slip centers is nonharmonic, and the system of phase-slip centers permits synchronization of internal oscillations at a microwave frequency by an external field with a frequency which is the n-th harmonic of internal oscillations. The estimated microwave power generated by a whisker is 10-8 W. Stimulation of superconductivity in a current-carrying whisker has been detected.
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