2008/09/17 by S. Johnston, F. Vernay, T. P. Devereaux
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.mtrl-sci #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1209/0295-5075/86/37007
published as Euro. Phys. Lett. 86, 37007 (2009) · 4 figures
arxiv created 2008/09/17 · openalex publication_date 2009/05/01 · arxiv updated 2010/11/03 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
Recent scanning tunneling microscopy studies have shown that local nanoscale pairing inhomogeneities are correlated with interstitial oxygen dopants in Bi 2 Sr 2 CaCu 2 O 8+δ . Combining electrostatic and cluster calculations, in this paper the impact of a dopant on the local Madelung and charge transfer energies, magnetic exchange J , Zhang-Rice mobility and interactions with the lattice is investigated. It is found that electrostatic modifications locally increase the charge transfer energy and slightly suppress J . It is further shown that coupling to c -axis phonons is strongly modified near the dopant. The combined effects of electrostatic modifications and coupling to the lattice yield broadened spectral features, reduced charge gap energies and a sizeable local increase of J . This implies a strong local interplay between antiferromagnetism, polarons and superconducting pairing.