论文信息 - Reaction and intermixing at metal‐superconductor interfaces: Fe/YBa2Cu3O6.9

Reaction and intermixing at metal‐superconductor interfaces: Fe/YBa2Cu3O6.9

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 A of coverage. These results demonstrate that reactive metal overlayers drastically alter the chemical and physical properties of the superconductor.

Yongli Gao | J. H. Weaver | D. Capone | B. Flandermeyer | T. Wagener

[1] Weaver,et al. Unoccupied electronic states and surface phenomena for YBa2Cu3O6.9. , 1987, Physical review. B, Condensed matter.

[2] Weaver,et al. Inverse photoemission studies of the empty electronic states and surface stability of La1.85Sr0.15CuO4. , 1987, Physical review. B, Condensed matter.

[3] Gallagher,et al. Direct observation of electronic anisotropy in single-crystal Y1Ba2Cu3O7-x. , 1987, Physical review letters.

[4] Freeman,et al. Electronically driven instabilities and superconductivity in the layered La2-xBaxCuO4 perovskites. , 1987, Physical review letters.

[5] Mattheiss. Electronic band properties and superconductivity in La2-yXyCuO4. , 1987, Physical review letters.

[6] F. Himpsel,et al. Energy dependence of cross sections in inverse photoemission , 1984 .

[7] Neville V. Smith,et al. Image-potential states and energy-loss satellites in inverse photoemission spectra , 1983 .

[8] J. Kanski,et al. The 4f1 level in barium studied with bremsstrahlung, energy loss and appearance potential spectroscopies , 1981 .

[9] G. Margaritondo,et al. Abruptness of Semiconductor-Metal Interfaces , 1981 .

[10] Y. Baer,et al. Bremsstrahlung isochromat spectroscopy using a modified XPS apparatus. , 1979, The Review of scientific instruments.

[11] Clifford A. Hampel,et al. Rare Metals Handbook , 1961 .