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Proximity-Effect and Tunneling in YBa2Cu3O7/Metal Layered Structures

  • L. H. Greene (a1), W. L. Feldmann (a1), J. B. Barrier (a1), L. A. Farrow (a1), P. F. Miceli (a1), R. Ramesh (a1), B. J. Wilkens (a1), B. G. Bagley (a1), M. Giroud (a2) and J.M. Rowell (a3)...


Superconducting thin films of YBa2Cu3O7 are prepared in-situ by on-axis, sputter deposition from a single, composite target. Our planar magnetron target composition of Y:Ba:Cu = 1.08:1.76:4.5 sputtered onto MgO at T~750°C in a 600mTorr Ar-O2 atmosphere yields reproducible superconducting films having Tc(R = 0)>80K and stoichiometry 1:2:3, that are shiny and of near epitaxial, crystalline quality. In order to ensure clean interfaces, YBa2Cu3O7/normal metal bilayers (to form SNS' Josephson junctions) and YBa2Cu3O7/normal metal/insulating barrier trilayers (to form SNIS' proximity tunnel junctions) are grown completely in-situ. (The S' = Pb counter electrode is evaporated ex-situ.) A supercurrent and Shapiro steps are observed in microwave irradiated SNS' (N = Ag) small area (5x10-5cm2) junctions. In SNIS' tunnel junctions, high-quality Pb tunneling is observed.



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1 See for example, Geerk, J., Xi, X. X., and Linker, G., Z. Phys B, 73, 329 (1988); A. Fournel, I. Oujia J. P. Sorbier, H. Noel J. C. Levet, M. Potel and P. Gougeon, Europhys. Lett. 6, 653 (1988); J. S. Tsai, I. Takeuchi, J. Fujita, S. Miura, T. Terashima. Y. Bando, K. Iljima and Y. Yamamoto Physica C 157, 537 (1989); M. Gurvitch, J. M. Valles, A. M. Cucolo, R. C. Dynes, J. P. Garno, L. F. Schneemeyer and J. V. Wasczak, Phys. Rev. Lett. 63,1008 (1989).
2 Hauser, J. J., Bacon, D. D. and Haemmerle, W. H., Phys. Rev. 151, 296 (1966); J. Geerk, M. Gurvitch, D. B. McWhan and J. M. Rowell, Physica 109 & 110B, 1775 (1982); For general review: E. L. Wolf Principles of Electron Tunneling Spectroscopy (Oxford University Press, N. Y., 1985) Chapter 5, and references therein.
3 Annett, J. F., Goldenfeld, N. and Renn, S. R., in Physical Properties of High Temperature Superconductors II, Ginsberg, D. M., ed., (World Scientific, Singapore, 1990) in press; N. Goldenfeld (private communication).
4 Greene, L. H., Barner, J. B., Feldmann, W. L., Farrow, L. A., Miceli, P. F., Ramesh, R., Wilkens, B. J., Bagley, B. G., Tarascon, J. M., Wernick, J. H., Giroud, M. and Rowell, J. M., in Proceedings of the International Conference on Materials and Mechanisms of Superconductivity-High Temperature Superconductivity, Stanford, CA, July 24–28, 1989, Physica C. (in press).
5 Eiken, J. W., Larson, T. M., Bergren, N. F., Nelson, A. J., Swartzlander, A. B., Kazmerski, L. L., Panson, A. J. and Blankenship, B. A., Appl. Phys. Lett. 52, 1819 (1988).
6 Moreland, J., Ono, R. H., Beall, J. A., Madden, M. and Nelson, A. J., Appl. Phys Lett. 54, 1477 (1989); K. Mizushima, M. Sagoi, T. Miura and J. Yoshida, Jpn. J. Appl. Phys. 27, L1489 (1988); H. Akoh, F. Shinoki, M. Takahashi and S. Takada, Jpn. J. Appl. Phys. 27, L519 (1988); P. M. Mankiewich, D. B. Schwartz, R. E. Howard, L. D. Jackel, B. L. Straughn, E. G. Burkhardt and A. H. Dayem, SPIE 948, 37 (1988); K. Mizushima, H. Kubota and Y. Yoshida, in Proceedings of the 2nd International Symposium on Superconductivity, Nov. 14-17, 1989, Tsukuba, Japan, (in press).
7 Budai, J. (private communication).
8 Bordet, P., Chaillout, C., Chenavas, J., Hodeau, J. L., Marezio, M., Karpinski, J. and Kaldis, E., Nature 334, 596 (1988); K. Char, M. Lee, R. W. Barton, A. F. Marshall, I. Bozovic, R. H. Hammond, M. R. Beasley, T. H. Geballe, A. Kapitulnik and S. S. Laderman, Phys. Rev. B 38, 834 (1988); J. Karpinski, E. Kaldis, E. Jilek, S. Rusiecki and B. Bucher, Nature, 336, 660 (1988); D. E. Morris, N. G. Asmar, J. H. Nickel, R. L. Sid, J. Y. T. Wei and J. E. Post, Physica C 159, 287 (1989).
9 Farrow, L. A., Venkatesan, T., Bonner, W. A., Wu, X. D., Inam, A. and Hegde, M. S., J. Appl Phys, 65, 4452 (1989); L. A. Farrow, S.-W. Chan, L. H. Greene and W. L. Feldmann, J. Appl. Phys 65, 2381 (1989).
10 Tsai, J. S., Kubo, Y. and Tabuchi, J., Phys Rev. Lett, 58, 1979 (1987); M. N. Keene, T. J. Jackson and C. E. Gough, Nature 340, 210 (1989).


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