C.M. Brown, L. Cristofolini, et al.
Chemistry of Materials
We have developed a scanning tunneling microscope (STM) capable of operating at temperatures as low as 0.4 K and fields as high as 8 T. We have used this STM to study the energy gap of the high- Tc superconductors La-Sr-Cu-O and Y-Ba-Cu-O. We find that the reduced gap for these oxide superconductors falls in the range 3 < 2A/kB Tc < 7, for polycrystalline, single-crystal, and thin-film samples. We have also simultaneously imaged the surface topography and superconducting energy gap for thin films of the granular superconductor NbN. We occasionally see regions with smaller best-fit gaps that correlate with surface topographical features, but have been unable so far to image flux vortices. © 1988, American Vacuum Society. All rights reserved.
C.M. Brown, L. Cristofolini, et al.
Chemistry of Materials
Ronald Troutman
Synthetic Metals
David B. Mitzi
Journal of Materials Chemistry
Corneliu Constantinescu
SPIE Optical Engineering + Applications 2009