Origin of spatial variation of pairing gap in Bi-based high-Tc cuprates

Abstract

Recently, scanning tunneling microscopy on Bi-2212 cuprate superconductor has revealed a spatial variation of the energy gap that is directly correlated with a modulation of the apical oxygen position. We identify two mechanisms by which out-of-plane oxygens can modulate the pairing interaction within the CuO_2 layer: a covalency between the x^2-y^2 band and apical p-orbital, and a screening of correlation U by apical oxygen polarization. Both effects strongly depend on the apical oxygen position and their cooperative action explains the experiment.

4 pages, 3 figures, revised version to appear in PRL

References in corpus (5)

• Imaging the impact on cuprate superconductivity of varying the inter-atomic distances within individual crystal unit-cells
• Doping dependent optical properties of Bi2Sr2CaCu2O8+d
• Enhancement of the superconducting critical temperature of Sr2CuO3+d up to 95K by ordering dopant atoms
• Dispersion of the odd magnetic resonant mode in near-optimally doped Bi2Sr2CaCu2O8+d
• Superconducting gap variations induced by structural supermodulation in BSCCO

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