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Electronic structure of the gold/Bi2Sr2CaCu2O8 and gold/EuBa2Cu3O7-δ interfaces as studied by photoemission spectroscopy

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12 Author(s)
Dessau, D.S. ; Stanford Electronics Laboratories, Stanford University, Stanford, California 94305 ; Shen, Z.‐X. ; Wells, B.O. ; Spicer, W.E.
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High‐resolution photoemission has been used to probe the electronic structure of the gold/Bi2Sr2CaCu2O8 and gold/EuBa2Cu3O7-δ interface formed by a low‐temperature (20 K) gold evaporation on cleaved high quality single crystals. We find that the metallicity of the EuBa2Cu3O7-δ substrate in the near surface region (∼5 Å) is essentially destroyed by the gold deposition, while the near surface region of Bi2Sr2CaCu2O8 remains metallic. This has potentially wide ranging consequences for the applicability of the different types of superconductors in real devices.

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Applied Physics Letters  (Volume:57 ,  Issue: 3 )