Electron Tunneling Into Single Crystals of YBa2Cu3O7-
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.
MSU 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.