Observation of large tunneling-conductance variations in direct mapping of the energy gap of single-crystal Bi2Sr2CaCu2O8-x

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

Research output: Contribution to journalArticle

Abstract

The tunneling conductance G(V,x,y) is mapped with 5 resolution on cleaved a-b planes of Bi2Sr2CaCu2O8-x 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) 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.

Original languageEnglish (US)
Pages (from-to)5692-5698
Number of pages7
JournalPhysical Review B
Volume46
Issue number9
DOIs
StatePublished - 1992

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Energy gap
Single crystals
Spectroscopy
Vacuum
Scanning
Crystals
single crystals
metallicity
spacing
vacuum
scanning
spectroscopy
crystals

ASJC Scopus subject areas

  • Condensed Matter Physics

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Observation of large tunneling-conductance variations in direct mapping of the energy gap of single-crystal Bi2Sr2CaCu2O8-x. / Chang, A.; Rong, Zhao Y.; Ivanchenko, Yu M.; Lu, Farun; Wolf, E. L.

In: Physical Review B, Vol. 46, No. 9, 1992, p. 5692-5698.

Research output: Contribution to journalArticle

Chang, A. ; Rong, Zhao Y. ; Ivanchenko, Yu M. ; Lu, Farun ; Wolf, E. L. / Observation of large tunneling-conductance variations in direct mapping of the energy gap of single-crystal Bi2Sr2CaCu2O8-x. In: Physical Review B. 1992 ; Vol. 46, No. 9. pp. 5692-5698.
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