Low frequency noise in ballistic Nb/Ag point contacts

Details Low frequency noise in ballistic Nb/Ag point contacts Low frequency noise in ballistic Nb/Ag point contacts

2010-04-30

arxiv.org/abs/1004.5451v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

We report on the low frequency noise in the ballistic point-contacts between a silver tip and a niobium foil. The ballistic nature of the point-contacts is confirmed by Andreev reflection spectroscopy at low bias voltage with the Nb foil cooled below its superconducting transition temperature ($T_c$). We find that the voltage dependence of the low frequency noise differs for different point-contacts with varying contact resistances. At high bias voltages, random two level fluctuations appear and dominate over the background $1/f$ noise. From analysis of the Andreev reflection spectra, we show that such two level fluctuators may give rise to depairing of the superconducting order parameter.

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