Fluctuation dominated Josephson tunneling with a scanning tunneling microscope - art. no. 097004

Citation
O. Naaman et al., Fluctuation dominated Josephson tunneling with a scanning tunneling microscope - art. no. 097004, PHYS REV L, 8709(9), 2001, pp. 7004
Citations number
24
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
8709
Issue
9
Year of publication
2001
Database
ISI
SICI code
0031-9007(20010827)8709:9<7004:FDJTWA>2.0.ZU;2-Z
Abstract
We demonstrate Josephson tunneling in vacuum tunnel junctions formed betwee n a superconducting scanning tunneling microscope tip and a Pb film, for ju nction resistances in the range 50-300 k Omega. We show that the supercondu cting phase dynamics is dominated by thermal fluctuations, and that the Jos ephson current appears as a peak centered at small finite voltage. In the p resence of microwave fields (f = 15.0 GHz) the peak decreases in magnitude and shifts to higher voltages with increasing rf power, in agreement with t heory.