Scanning tunneling spectroscopy measurements on the high-temperature superconductor Bi2Sr2CaCu2O8+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.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Aug 16 2010|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics