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.

References in corpus (13)

• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Band-structure trend in hole-doped cuprates and correlation with Tcmax
• Charge density wave origin of cuprate checkerboard visualized by scanning tunneling microscopy
• Revision of model parameters for kappa-type charge transfer salts: an ab initio study
• One-band tight-binding model parametrization of the high-$T_c$ cuprates, including the effect of $k_z$-dispersion
• Dopant-modulated pair interaction in cuprate superconductors
• Relation of Extended Van Hove Singularities to High-Temperature Superconductivity within Strong-Coupling Theory
• Correlation Strength, Gaps and Particle-Hole Asymmetry in High-Tc Cuprates: a Dynamical Mean Field Study of the Three-Band Copper-Oxide Model
• Inhomogeneity-induced enhancement of the pairing interaction in cuprates
• Local electronic structure near oxygen dopants in BSCCO-2212: a window on the high-Tc pair mechanism?
• Structure of BSCCO supermodulation from ab initio calculations
• The Impact of an Oxygen Dopant in an ideal Bi-2212 Crystal
• Effect of dopant atoms on local superexchange in cuprate superconductors: a perturbative treatment

Cited by in corpus (9)

• Spatial inhomogeneity and chiral symmetry of the lattice incommensurate supermodulation in high temperature superconductor Bi2Sr2CaCu2O8+y
• Universal Disorder in Bi2Sr2CaCu2O8+x
• Ab initio description of the Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ electronic structure
• Local modulations of the spin-fluctuation mediated pairing interaction by impurities in d-wave superconductors
• Raising the critical temperature by disorder in unconventional superconductors mediated by spin fluctuations
• Doping Dependence of Gap Inhomogeneities at Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ Surfaces
• 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
• Robust determination of superconducting gap sign changes via quasiparticle interference