Abstract
All-YBa2Cu3O7−x (YBCO) superconductor-insulator-superconductor (SIS) edge-type tunnel junctions have been fabricated. This leads to the observation of superconductive tunneling with very low small-bias conductance for the first time in fabricated all-YBCO junctions. The presence of a superconductive gap of YBCO with a complete suppression of the density of states at the Fermi surface is evident from dynamic conductance measurements. The approach to all-YBCO SIS edge junctions is discussed.
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