Phys. Rev. Lett. 87, 097004 (2001) [4 pages]Fluctuation Dominated Josephson Tunneling with a Scanning Tunneling MicroscopeReceived 9 March 2001; published 14 August 2001 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 kΩ. 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 voltage. In the presence of microwave fields ( f = 15.0GHz) the peak decreases in magnitude and shifts to higher voltages with increasing rf power, in agreement with theory. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.097004
DOI:
10.1103/PhysRevLett.87.097004
PACS:
74.50.+r, 07.79.Cz, 74.40.+k
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