Effects of lead doping on Tc and energy gap of Bi2Sr2CaCu2O8 by tunneling spectroscopy

Jeffrey Kane, K. W. Ng, D. Moecher

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Doping the high-Tc superconductor Bi2Sr2CaCu2O8 (Bi-2212) with lead causes a partial substitution of the Bi atoms between the conducting CuO2 planes, and modifies some of the electronic and structural properties of the material. We have studied Pb-doped Bi-2212 single crystals using a tunneling technique. We find that while Pb doping decreases Tc significantly, it has a minimal effect on the in-plane energy gap, leading to an increase in the reduced gap, 2Δ/kTc. This result is consistent with other studies of the effects of in-plane dopants on Bi-2212, but is the first evidence of such an effect attributable to defects introduced out of the plane. Inspection of the physical evidence leads to the conclusion that the inter-layer coupling has been modified and indicates a connection between high-Tc superconductivity and the inter-layer coupling between the CuO2 planes.

Original languageEnglish
Pages (from-to)176-182
Number of pages7
JournalPhysica C: Superconductivity and its Applications
Issue number3-4
StatePublished - Jan 1 1998

Bibliographical note

Funding Information:
The authors gratefully acknowledge Professor C.P. Brock, University of Kentucky Department of Chemistry, for guidance on XRD techniques. This work was supported by the National Science Foundation through Grant No. DMR-9623842.


  • Energy gap
  • Substitution effects
  • Tunneling spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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