Fusion of bogoliubons in Ba_1-xK_xFe₂As₂ and similarity of energy scales in high temperature superconductors

2011/06/22 by D. V. Evtushinsky, Evtushinsky, D. V., Tae Kyu Kim +23
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Superconductivity (cond-mat.supr-con)

paper · pdf · doi:10.48550/arxiv.1106.4584

openalex publication_date 2011/06/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Usually the superconducting pairing is considered to modify electronic states only in a narrow momentum range close to the Fermi surface. Here we present a direct experimental observation of fusion of Bogoliubov dispersion branches originating from the antipodal Fermi crossings by means of angle-resolved photoemission spectroscopy (ARPES). Uncommon discernibility and brightness of bogoliubons' fusion stems from comparability of the superconducting gap magnitude and the distance from the Fermi level to the band's top, and strong electron scattering on a mode with similar energy. Such similarity of the electronic and pairing energy scales seems to be a persistent associate of high-temperature superconductivity (HTSC) rather than just a mere coincidence.

Related

• A spectroscopic fingerprint of electron correlation in high temperature superconductors
• Evidence of a universal relation between electron-mode coupling and Tc in Ba1-xKxFe2As2 superconductor from Laser ARPES
• High Tc Superconductors: New Insights from Angle-Resolved Photoemission
• Exploring the Unconventional Electron Distribution Patterns in Iron-based Superconductors
• Photoemission in the High Tc Superconductors