A systematic study of the conductance of Y1-xPrxBa2Cu3O7Pb planar tunnel junctions as a function of Pr concentration, x, and crystallographic orientation is presented. For fixed Pr concentration, the tunneling conductance is the same when tunneling into (100)-, (110)-, and (103)-oriented films, but qualitatively different than tunneling into (001)-oriented films. In addition, the gap-like feature energy (~2kBTc) scales with Tc but only when tunneling in the ab-plane direction. An ongoing experiment characterizing a novel tunnel junction fabrication technique using self-assembled monolayers as insulating tunnel barriers is also discussed.
ASJC Scopus subject areas
- Physics and Astronomy(all)