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

Abstract

Scanning tunneling spectroscopy measurements on the high temperature superconductor Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ 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.

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Cited by in corpus (4)

• Universal Disorder in Bi2Sr2CaCu2O8+x
• Local modulations of the spin-fluctuation mediated pairing interaction by impurities in d-wave superconductors
• First principle prediction of structural distortions in the cuprates and their impact on the electronic structure
• The Low-Temperature Phenomenology of Gap Inhomogeneity in the Cuprate Superconductors: High-Energy Granularity, Low-Energy Homogeneity, and Spectral Kinks