Abstract

Intrinsic Josephson junctions on Bi2Sr2CaCu2O8+δ singlecrystals are successfully fabricated using photolithography and Ar ionmilling. Here we discuss the properties of the surface CuO2/metalbilayers and surface junctions prepared with different crystal cleavageconditions and metal film deposition techniques. We show that, by cleavingthe crystal at liquid nitrogen temperature in vacuum, the contents of the(interstitial) oxygen in the Bi-O layers become stable upon cleavage,leading to a CuO2/metal bilayer and to surface junctions with reproducibleproperties. These results can be useful for practical device fabrications aswell as for the studies of the contact properties between high Tcsuperconductors and normal metals.

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