Abstract

We observed periodic oscillations in the differential resistance vs. voltage curves of Au/Bi 2Sr 2CaCu 2O 8 + x (Au/Bi2212) junctions near the bulk superconducting transition temperature T c of the Bi2212 single crystals. The oscillations can be explained in terms of the McMillan–Rowell coherent states resulting from the Andreev-reflected quasiparticles in the normal-metallic layer. This is the first observation of the McMillan–Rowell oscillations in the c-axis transport of the Bi2212 material.

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