Abstract
We report an experimental observation of a stochastic resonance pheomenon in single-crystal Nb. Measurements of the nonlinear susceptibility of Nb ${(T}_{c}\ensuremath{\approx}9.15 \mathrm{K})$ have been performed as a function of temperature, and applied dc and ac fields. The latter consist of a high-frequency signal with an amplitude modulation at low-frequency. Nonmonotonic changes of the nonlinear response have been found as a function of the dc and ac fields in a surface superconducting state of Nb. The theoretical analysis based on the two level model of a stochastic resonance phenomenon provides a qualitative explanation of the experimental results.
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