Formation of an Andreev bound state at the step edges of Bi2Sr2CaCu2O8+δ surface

S. Misra, S. Oh, D. J. Hornbaker, T. DiLuccio, J. N. Eckstein, Ali Yazdani

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Abstract

We have used a scanning tunneling microscope to measure the density of electronic states (DOS) in the vicinity of step edges and twin boundaries on the surface of Bi2Sr2CaCu2O8+δ. We find that 90° twin boundaries do not perturb superconducting DOS at all; however, near step edges, within a coherence length in the direction perpendicular to step, we find strong filling-in of the energy gap in the DOS. In this region of suppressed superconductivity, for step edges oriented at a 45° degree relative to the CU-O bond direction, the spectra show evidence for the formation of an Andreev bound state, which results in a resonance in the DOS at the Fermi level.

Original languageEnglish (US)
Article number100510
Pages (from-to)1005101-1005104
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number10
DOIs
StatePublished - Sep 1 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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