Electron tunneling spectroscopy of single-crystal Bi2Sr2CaCu2O8

H. J. Tao, A. Chang, Farun Lu, E. L. Wolf

Research output: Contribution to journalArticle

Abstract

The T-dependent conductance G(V,T) of evaporated Pb junctions on cleaved ab planes of Bi2Sr2CaCu2O8 (2:2:1:2) crystals is presented. Strong superconducting Gs(V,T) structures imply a large gap, approximately 0(0)=26 meV, or 20(0)/kBTc=6.7. An analysis of G(V,T) near Tc, assuming a lifetime-broadened BCS Ns(E), reveals a broadening (T) such that (Tc) (Tc) 2kBTc. The fitted (Tc), unlike typical BCS values, is 0.8(0). $G(V,T>T sub c) has a minimum at V=0, suggestive of known c-direction localization in 2:2:1:2 compounds. G(V,T) also reveals the expected fluctuation superconductivity above Tc. 4.2-K scanning-tunneling-microscope (STM) spectra are mentioned in comparison. A larger gap, about 40 meV, and dip at 80 meV, found in the STM G(V) are tentatively attributed to CuO2 planes.

Original languageEnglish (US)
Pages (from-to)10622-10632
Number of pages11
JournalPhysical Review B
Volume45
Issue number18
DOIs
StatePublished - 1992

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Electron tunneling
electron tunneling
Microscopes
microscopes
Single crystals
Spectroscopy
Scanning
scanning
single crystals
Superconductivity
spectroscopy
superconductivity
life (durability)
Crystals
crystals
Direction compound

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Electron tunneling spectroscopy of single-crystal Bi2Sr2CaCu2O8. / Tao, H. J.; Chang, A.; Lu, Farun; Wolf, E. L.

In: Physical Review B, Vol. 45, No. 18, 1992, p. 10622-10632.

Research output: Contribution to journalArticle

Tao, HJ, Chang, A, Lu, F & Wolf, EL 1992, 'Electron tunneling spectroscopy of single-crystal Bi2Sr2CaCu2O8', Physical Review B, vol. 45, no. 18, pp. 10622-10632. https://doi.org/10.1103/PhysRevB.45.10622
Tao, H. J. ; Chang, A. ; Lu, Farun ; Wolf, E. L. / Electron tunneling spectroscopy of single-crystal Bi2Sr2CaCu2O8. In: Physical Review B. 1992 ; Vol. 45, No. 18. pp. 10622-10632.
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