Fluctuation Dominated Josephson Tunneling with a Scanning Tunneling Microscope

Details Fluctuation Dominated Josephson Tunneling with a Scanning Tunneling Microscope Fluctuation Dominated Josephson Tunneling with a Scanning Tunneling Microscope

2001-03-10

arxiv.org/abs/cond-mat/0103229v1

Phys. Rev. Lett. 87, 097004 (2001)

Physics

Condensed Matter

Superconductivity

4 pages, REVTeX, submitted to PRL

Scientific paper

10.1103/PhysRevLett.87.097004

We demonstrate Josephson tunneling in vacuum tunnel junctions formed between a superconducting scanning tunneling microscope tip and a Pb film, for junction resistances in the range 50-300 k$\Omega$. We show that the superconducting phase dynamics is dominated by thermal fluctuations, and that the Josephson current appears as a peak centered at small finite voltages. In the presence of microwave fields (f=15.0 GHz) the peak decreases in magnitude and shifts to higher voltages with increasing rf power, in agreement with theory.

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