Fluctuation Dominated Josephson Tunneling with a Scanning Tunneling Microscope
O. Naaman, W. Teizer, R. C. Dynes
DOI 10.1103/PhysRevLett.87.097004 · Physical Review Letters
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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 50–300kΩ. 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.8 | Pressure not reported | unknown |
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