title: Fluctuation dominated Josephson tunneling with a scanning tunneling microscope.
abstract: 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 voltage. 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.
authors.affiliation: Department of Physics, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0319, USA.
authors.forename: O
authors.initials: O
authors.lastname: Naaman
authors.forename: W
authors.initials: W
authors.lastname: Teizer
authors.forename: R C
authors.initials: RC
authors.lastname: Dynes