Electron Tunneling Into Single Crystals of YBa2Cu3O7-

Authors

James M. Valles, Brown UniversityFollow
Robert C. Dynes, University of California at San Diego
A. M. Cucolo, University of SalernoFollow
Michael Gurvitch, Stony Brook UniversityFollow
Lynn Schneemeyer, Montclair State UniversityFollow
J. P. Garno, University of Illinois at Urbana-ChampaignFollow
Joseph V. Waszczak, University of WashingtonFollow

Document Type

Article

Publication Date

1-1-1991

Abstract

We have fabricated tunnel junctions between chemically etched single crystals of YBa2Cu3O7- and evaporated metal counterelectrodes that exhibit reproducible characteristics. Above the bulk critical temperature of YBa2Cu3O7-, Tc, the conductance as a function of voltage, G(V), has a linear dependence on voltage and some asymmetry. Below Tc, additional structure associated with the superconducting state appears in G(V). At TTc there is a reproducible finite zero-bias conductance, which suggests that there are states at the Fermi energy in superconducting YBa2Cu3O7-. Junctions with Pb, Sn, Bi, Sb, PbBi, and Au counterelectrodes all show qualitatively similar behavior.

DOI

10.1103/PhysRevB.44.11986

Montclair State University Digital Commons Citation

Valles, James M.; Dynes, Robert C.; Cucolo, A. M.; Gurvitch, Michael; Schneemeyer, Lynn; Garno, J. P.; and Waszczak, Joseph V., "Electron Tunneling Into Single Crystals of YBa2Cu3O7-" (1991). Department of Chemistry and Biochemistry Faculty Scholarship and Creative Works. 446.
https://digitalcommons.montclair.edu/chem-biochem-facpubs/446