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Point-contact electron tunneling into the high-Tc superconductor Y-Ba-Cu-O

M. D. Kirk, D. P. E. Smith, D. B. Mitzi, J. Z. Sun, D. J. Webb, K. Char, M. R. Hahn, M. Naito, B. Oh, M. R. Beasley, T. H. Geballe, R. H. Hammond, A. Kapitulnik, and C. F. Quate
Phys. Rev. B 35, 8850(R) – Published 1 June 1987
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Abstract

We report results of a study of electron tunneling into bulk samples of the new high-Tc superconductor Y-Ba-Cu-O using point-contact tunneling. Based on a superconductive tunneling interpretation, the results show exceptionally large energy gaps in these materials (roughly 2Δ=100 meV), implying 2Δ/kCTc∼13. Similar values were found previously by us for La-Sr-Cu-O. We also see Structure in the I-V curves similar to that seen in La-Sr-Cu-O. On the basis of the asymmetries observed in the I-V characteristics, we believe that the natural tunneling barrier on this material is of the Schottky type.

  • Received 18 March 1987

DOI:https://doi.org/10.1103/PhysRevB.35.8850

©1987 American Physical Society

Authors & Affiliations

M. D. Kirk, D. P. E. Smith, D. B. Mitzi, J. Z. Sun, D. J. Webb, K. Char, M. R. Hahn, M. Naito, B. Oh, M. R. Beasley, T. H. Geballe, R. H. Hammond, A. Kapitulnik, and C. F. Quate

  • Department of Applied Physics, Stanford University, Stanford, California 94305

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Vol. 35, Iss. 16 — 1 June 1987

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