Inverse photoemission studies of the interface formed when Fe is deposited onto the high-temperature superconductor YBa2Cu3O6.9 show that Fe leaches oxygen from the near surface region to nucleate an insulating form of Fe-O. Ultimately, a metallic Fe layer grows but it has surface segregated Ba, even after 250 Å of coverage. These results demonstrate that reactive metal overlayers drastically alter the chemical and physical properties of the superconductor.
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Gao et al. (1987) studied this question.
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