Local spectroscopy of a proximity superconductor at very low temperature

Details Local spectroscopy of a proximity superconductor at very low temperature Local spectroscopy of a proximity superconductor at very low temperature

2001-06-15

arxiv.org/abs/cond-mat/0106299v1

Europhys. Lett. 55, 861 (2001)

Physics

Condensed Matter

Superconductivity

7 pages, 3 figures

Scientific paper

10.1209/epl/i2001-00361-2

We performed the local spectroscopy of a Normal-metal--Superconductor (N-S) junction with the help of a very low temperature (60 mK) Scanning Tunneling Microscope (STM). The spatial dependence of the local density of states was probed locally in the vicinity of the N-S interface. We observed spectra with a fully-developed gap in the regions where a thin normal metal layer caps the superconductor dot. Close to the S metal edge, a clear pseudo-gap shows up, which is characteristic of the superconducting proximity effect in the case of a long normal metal. The experimental results are compared to the predictions of the quasiclassical theory.

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