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 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.

4 pages, REVTeX, submitted to PRL

References in corpus (4)

• Imaging the Effects of Individual Zinc Impurity Atoms on Superconductivity in Bi2Sr2CaCu2O8+delta
• STM Studies of the Electronic Structure of Vortex Cores in Bi2Sr2CaCu2O8+d
• Nanometer Scale Mapping of the Density of States in an Inhomogeneous Superconductor
• The fabrication of reproducible superconducting scanning tunneling microscope tips

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