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Effect of Ion-beam Radiation on the Anisotropy of Resistivity in YBa 2 Cu 3 O 7-δ Thin Films

  • J. Z. Wu (a1), Z. H. Zhang (a2), V. W. Chen (a2), N. Yu (a3) and W. K. Chu (a2)...

Abstract

Different behaviors of the normal-state resistivity have been observed in (110)-, (113)- and a-oriented YBa2Cu3O7-δ thin films under 200 keV H+ irradiation. It suggests that the c-axis electrical conduction is very sensitive to nonoxygen point defects and a ”semiconductor-metal” phase transition could be induced at very low densities of these defects.

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1 Iye, Y., ”Phys. Properties of High Temp. Superconductors III”, (World Scientific, Singapore, 1992), P285.
2 Ito, T., Takagi, H., Ishibashi, S., Ido, T. and Uchida, S., Nature, 350, 596 (1991).
3 Wu, J. Z., Yu, N., and Chu, W. K., Phys. Rev. B48, 9929(1993).
4 Wu, J. Z., Hsieh, P. Y., McGuire, A. V., Schmidt, D. L., Wood, L. T., Shen, Y., and Chu, W. K., Phys. Rev. B 44, 12643 (1991).
5 Wu, J. Z. and Chu, W. K., to be published in Phys. Rev. B, Jan.(l994).
6 Wu, J. Z., Yu, N., Kulik, J., Zhang, Z. H., Chen, V. W. and Chu, W. K., ”Preceding of the 6th US/Japan Workshop on High Tc Superconductors”, Houston, Dec. 6–7, 1993.
7 Valles, J. M. et al. , Phys. Rev. B39, 11599(1989).

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