Journal of Superconductivity

, Volume 9, Issue 4, pp 343–348

Tuning of the Fermi level at the second subband of a superlattice of quantum wires in the CuO2 plane: A possible mechanism to raise the critical temperature

  • N. L. Saini
  • T. Rossetti
  • A. Lanzara
  • M. Missori
  • A. Perali
  • H. Oyanagi
  • A. Bianconi
Article

Abstract

The structure of the stripes in Bi2Sr2CaCu22O8+y superconductor has been refined by polarized CuK-edge extended X-ray absorption fine structure (EXAFS). The distribution of Cu-O (planar) distances range from 1.87 Å to 1.96 Å. The results show that the in-plane CuO2 lattice distortions in the 1D modulation are large enough to form a potential barrier of widthW between the stripes of undistorted CuO2 lattice of widthL=15±0.5 Å. The calculations show that the maximum of the density of states formed by the second subband is tuned to the Fermi level.

Key words

Superconductivity EXAFS superstructure quantum wires nonhomogeneity 

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Copyright information

© Plenum Publishing Corporation 1996

Authors and Affiliations

  • N. L. Saini
    • 1
  • T. Rossetti
    • 1
  • A. Lanzara
    • 1
  • M. Missori
    • 1
  • A. Perali
    • 1
  • H. Oyanagi
    • 2
  • A. Bianconi
    • 1
  1. 1.Dipartimento di FisicaUniversità di Roma “La Sapienza,”RomeItaly
  2. 2.Electrotechnical LaboratoryTsukubaJapan

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