Tunneling spectroscopy of the quasiparticle Andreev bound state in ion-irradiated/Pb junctions

M. Aprili, M. Covington, E. Paraoanu, B. Niedermeier, L. Greene

Research output: Contribution to journalArticlepeer-review

Abstract

Effects of disorder on the in-plane density of states of YBa2Cu3O7-δ are investigated by planar tunneling spectroscopy. Low-fluence 1-MeV He+ irradiation reduces the YBa2Cu3O7-δ Tc and mean-free path without altering the junction quality. As the dirty limit is approached, the zero-bias conductance peak (ZBCP) disappears, as expected for a quasiparticle Andreev bound state. Thus, the quasiparticle scattering rate may be determined by the ZBCP magnitude. This rate is a direct measure of the pair-breaking strength and accounts for the Tc suppression.

Original languageEnglish (US)
Pages (from-to)R8139-R8142
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume57
Issue number14
DOIs
StatePublished - 1998
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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