TITLE

Energy-gap spectroscopy of superconductors using a tunneling microscope

AUTHOR(S)
Le Duc, H. G.; Kaiser, W. J.; Stern, J. A.
PUB. DATE
June 1987
SOURCE
Applied Physics Letters;6/29/1987, Vol. 50 Issue 26, p1921
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A unique scanning tunneling microscope (STM) system has been developed for spectroscopy of the superconducting energy gap. High-resolution control of tunnel current and voltage allows for measurement of superconducting properties at tunnel resistance levels 102–103 greater than that achieved in prior work. The previously used STM methods for superconductor spectroscopy are compared to those developed for the work reported here. Superconducting energy-gap spectra are reported for three superconductors, Pb, PbBi, and NbN, over a range of tunnel resistance. The measured spectra are compared directly to theory.
ACCESSION #
9823379

 

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