Aluminum and gold deposition on cleaved single crystals of Bi2CaSr2Cu2O8 superconductor

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Abstract
We have used photoelectron spectroscopy to study the changes in the electronic structure of cleaved, single crystal Bi2CaSr2 Cu 2O8 caused by deposition of aluminum and gold. Al reacts strongly with the superconductor surface. Even the lowest coverages of Al reduces the valency of Cu in the superconductor, draws oxygen out of the bulk, and strongly modifies the electronic states in the valence band. The Au shows little reaction with the superconductor surface. Underneath Au, the Cu valency is unchanged and the core peaks show no chemically shifted components. Au appears to passivate the surface of the superconductor and thus may aid in the processing of the Bi‐Ca‐Sr‐Cu‐O material. These results are consistent with earlier studies of Al and Au interfaces with other, polycrystalline oxide superconductors. Comparing with our own previous results, we conclude that Au is superior to Ag in passivating the Bi‐Ca‐Sr‐Cu‐O surface.

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