, 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

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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.

The authors are thankful to Y. Nishihara and D. H. Ha for crystal grow and H. Yamaguchi for experimental help. One of us (NLS) would like to thank the TRIL program of International Center for Theoretical Physics, Trieste, Italy for financial support.