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

M. Mori; G. Khaliullin; T. Tohyama; S. Maekawa

doi:10.1103/PhysRevLett.101.247003

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

Superconductivity 2016-09-08 v2 Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons

Authors: M. Mori , G. Khaliullin , T. Tohyama , S. Maekawa

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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.

Keywords

high-tc cuprates pairing gap spatial variation apical oxygen scanning tunneling microscopy cuo2 layer

Cite

@article{arxiv.0805.1281,
  title  = {Origin of spatial variation of pairing gap in Bi-based high-Tc cuprates},
  author = {M. Mori and G. Khaliullin and T. Tohyama and S. Maekawa},
  journal= {arXiv preprint arXiv:0805.1281},
  year   = {2016}
}

Comments

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

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

Abstract

Keywords

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