Subharmonic gap structure in superconducting scanning tunneling microscope junctions

Details Subharmonic gap structure in superconducting scanning tunneling microscope junctions Subharmonic gap structure in superconducting scanning tunneling microscope junctions

2003-05-23

arxiv.org/abs/cond-mat/0305572v2

Solid State Commun. 129, p.299 (2004)

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures. Added figure and references. Accepted in Solid State Commun

Scientific paper

10.1016/j.ssc.2003.10.022

We observe a subharmonic gap sturucture (SGS) and the Josephson effect in superconducting scanning tunneling microscope junctions with resistances below 100 kOhm. The magnitude of the n=2 SGS is shown to scale with the square of the junction normal state conductance, in agreement with theory. We show by analyzing the Josephson effect in these junctions that the superconducting phase dynamics are strongly affected by thermal fluctuations. We estimate the linewidth of the Josephson oscillations due to phase fluctuations, a quantity that may be important in modern theories of the subgap structure. While phase fluctuations may smear the SGS current onsets, we conclude that the sharpness of these onsets in our data is not limited by fluctuations.

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