Abstract
Current-imaging tunneling spectroscopy (CITS) was performed on cold-cleaved single crystals of ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}x}$ at 20 K. CITS data include $I(V)$ curves taken simultaneously with a topographic scanning tunneling microscopic image. $I(V)$ curves taken on CuO chains show an energy gap of about 20 meV which disappears near oxygen vacancies. We explain several features of large-junction $I(V)$ measurements, photoemission spectroscopy, and single-point $I(V)$ spectroscopy in terms of local effects detected by our CITS measurements. Finally, we consider the possibilities that this energy gap is due to either a charge-density wave or proximity-coupled superconductivity from the ${\mathrm{CuO}}_{2}$ planes.
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