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Modulation of pairing interaction in Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ by an O dopant: a density functional theory study

Scanning tunneling spectroscopy measurements on the high temperature superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ have reported an enhanced spectral gap in the neighborhood of O dopant atoms. We calculate, within density functional theory (DFT), the change in electronic structure due to such a dopant. We then construct and discuss the validity of several tight binding (TB) fits to the DFT bands with and without an O dopant. With the doping-modulated TB parameters, we finally evaluate the spin susceptibility and pairing interaction within spin fluctuation theory. The d-wave pairing eigenvalues are enhanced above the pure system without O dopant, supporting the picture of enhanced local pairing around such a defect.

preprint2010arXivOpen access
Kateryna FoyevtsovaH. C. KandpalHarald O. JeschkeS. GraserH. -P. ChengRoser ValentíP. J. Hirschfeld
cond-mat.supr-con
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Kateryna FoyevtsovaH. C. KandpalHarald O. JeschkeS. GraserH. -P. ChengRoser ValentíP. J. Hirschfeld

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