Observation of large tunneling-conductance variations in direct mapping of the energy gap of single-crystal Bi2Sr2CaCu2O8x

A. Chang, Zhao Y. Rong, Yu. M. Ivanchenko, Farun Lu, and E. L. Wolf
Phys. Rev. B 46, 5692 – Published 1 September 1992
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Abstract

The tunneling conductance G(V,x,y) is mapped with 5 Å resolution on cleaved a-b planes of Bi2Sr2CaCu2O8x crystals (Tc=90 K) using scanning (vacuum) tunneling spectroscopy at 4.2 K. A strong, spatially varying G(V,x,y), evidently arising from a superconducting gap Δc, is observed on the a-b plane. A more highly peaked G(V) with reduced peak spacing is seen near (∼50 Å) specific sites, and over broader areas. It is suggested that the striking variations in G(V,x,y) probably indicate local variations in BiO-layer metallicity, revealing an internal superconducting proximity effect between BiO and CuO2 layers.

  • Received 1 May 1992

DOI:https://doi.org/10.1103/PhysRevB.46.5692

©1992 American Physical Society

Authors & Affiliations

A. Chang, Zhao Y. Rong, Yu. M. Ivanchenko, Farun Lu, and E. L. Wolf

  • Department of Physics, Polytechnic University, Brooklyn, New York 11201

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Vol. 46, Iss. 9 — 1 September 1992

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