Abstract
Properties of the superconducting surface CuO 2 double layers of a cleaved Bi 2Sr 2CaCu 2O 8+ δ (BSCCO) crystal in contact with Au metal films are studied using mesa-structured intrinsic Josephson junctions. We show that a well-defined and experimentally controllable BSCCO/Au contact can be achieved by the stabilization of the (interstitial) oxygen atoms in the surface BiO layers at liquid nitrogen temperature during fabrication. The surface CuO 2 double layers are found to be in a metallic contact with Au films and have a transition temperature T ′ c of ∼80 K for a BSCCO crystal with bulk T c of 91 K. Involvement of impurity atoms or molecules in the BSCCO/Au interface is found to substantially reduce the value of T ′ c.
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