Impurity-induced bound excitations on the surface of Bi2Sr2CaCu2O8

Ali Yazdani, C. M. Howald, C. P. Lutz, A. Kapitulnik, D. M. Eigler

Research output: Contribution to journalArticlepeer-review

185 Scopus citations


We have probed the effects of atomic-scale impurities on superconductivity in Bi2Sr2CaCu2O8 by performing low-temperature tunneling spectroscopy measurements with a scanning tunneling microscope. Our results show that nonmagnetic defect structures at the surface create localized low-energy excitations in their immediate vicinity. The impurity-induced excitations occur over a range of energies, including the middle of the superconducting gap, at the Fermi level. Such a zero bias state is a predicted feature for strong nonmagnetic scattering in a d-wave superconductor.

Original languageEnglish (US)
Pages (from-to)176-179
Number of pages4
JournalPhysical review letters
Issue number1
StatePublished - 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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