Abstract
Silver coatings were magnetron sputtered onto the surface of highly c-axis-oriented HgBa 2CaCu 2O 6+ δ superconducting thin films exhibiting zero resistance T c at about 120 K and the critical current density ∼10 5 A/cm 2 at 100 K. Electrical resistance of the Ag/HgBa 2CaCu 2O 6+ δ planar interface and current–voltage dependencies were investigated in a course of post-deposition annealing of the Ag/HgBa 2CaCu 2O 6+ δ at 50–350°C in both pure oxygen and oxygen-free ambient. Results of the electrical measurements are explained in terms of the insulating layer formation at the Ag/HgBa 2CaCu 2O 6+ δ interface. It is assumed this insulator is a product created by oxygen non-stoichiometry and decomposition of the superconductor at the interface between both materials.
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