A diffusion phenomenon in Y-Ba-Cu-O superconductors

Melmed, A. J.; Camus, P. P.; Ernst, Norbert; Schmidt, W.A.; Bozdech, Georg; Naschitzki, Matthias

doi:10.1016/0039-6028(91)90410-T

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A diffusion phenomenon in Y-Ba-Cu-O superconductors

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Ernst, Norbert
Fritz Haber Institute, Max Planck Society;

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Schmidt, W.A.
Fritz Haber Institute, Max Planck Society;

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Bozdech, Georg
Fritz Haber Institute, Max Planck Society;

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Naschitzki, Matthias
Fritz Haber Institute, Max Planck Society;

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Citation

Melmed, A. J., Camus, P. P., Ernst, N., Schmidt, W., Bozdech, G., & Naschitzki, M. (1991). A diffusion phenomenon in Y-Ba-Cu-O superconductors. Surface Science, 246(1-3), 173-176. doi:10.1016/0039-6028(91)90410-T.

Cite as: https://hdl.handle.net/21.11116/0000-0009-F0C4-A

Abstract

The influence of a negative electric field on the near-surface composition of Y-Ba-Cu-O superconductors, which have initially lost oxygen due to exposure to vacuum and FIM imaging, is investigated using a wide-angle atom probe. Field electron emission of about 10⁻⁸ A for about 10 min, at 85 K, causes significant changes in composition which are interpreted to mean primarily that oxygen has diffused to the surface and desorbed, resulting in a more metallic surface. These changes are correlated with recently observed shifts in field ion- and field-electron energy spectra.