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

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

2008-05-09

arxiv.org/abs/0805.1281v2

Phys. Rev. Lett. 101, 247003 (2008)

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1103/PhysRevLett.101.247003

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.

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