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, A. Yazdani
DOI 10.1103/PhysRevB.66.100510 · Physical Review B
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 84 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 84 | Pressure not reported | unknown |
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