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Low‐temperature scanning tunnelling microscopy and spectroscopy on Pb and Au
Author(s) -
Ramos M. A.,
Vieira S.,
Buendia A.,
Baro A. M.
Publication year - 1988
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1988.tb01371.x
Subject(s) - quantum tunnelling , spectroscopy , scanning tunneling microscope , condensed matter physics , scanning tunneling spectroscopy , superconductivity , materials science , conductance , microscopy , microscope , analytical chemistry (journal) , chemistry , physics , optics , chromatography , quantum mechanics
SUMMARY We have designed and built a scanning tunnelling microscope (STM) in order to work at temperatures ranging from 1·2 to 300 K. Tunnelling spectroscopy has been performed in Au and Pb with this STM. Our results on Au show different conductance‐voltage behaviours, their relation with the cleaning state of the tip being discussed. For Pb, the fitting of our I‐V characteristics to a BCS density of states gives A = 1·25 meV for the superconducting energy gap at about 5 K.