Modulation of pairing interaction in Bi2Sr2CaCu 2O8+δ by an O dopant: A density functional theory study

Kateryna Foyevtsova, H. C. Kandpal, Harald Olaf Jeschke, S. Graser, H. P. Cheng, Roser Valentí, P. J. Hirschfeld

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number054514
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number5
DOIs
Publication statusPublished - Aug 16 2010
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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