2008/03/31 by Hai-Jun Zhang, Haijun Zhang, Xu Gang +4 · 2 citations
Business, Management and Accounting · Materials Science · Mathematics · Physics and Astronomy · #Condensed matter physics #Corporate Taxation and Avoidance #Degeneracy (biology) #Degenerate energy levels #Electron #Fermi Gamma-ray Space Telescope #Geometry #Iron-based superconductors research #Line (geometry) #Mathematics #Physics #Plane (geometry) #Quantum mechanics #Rare-earth and actinide compounds #Space (punctuation) #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1088/0256-307x/26/1/017401
published as CHIN. PHYS. LETT. Vol. 26, No. 1 (2009) 017401 · 4 pages, 5 figures
arxiv created 2008/04/17 · openalex publication_date 2009/01/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The Fermi surfaces (FS) of LaOFeAs (in k z = 0 plane) consist of two hole-type circles around Γ point, which do not touch each other, and two electron-type co-centred ellipses around the M point, which are degenerate along the M – X line. By first-principles calculations, here we show that additional degeneracy exists for the two electron-type FS, and the crucial role of F-doping and pressure is to enhance this orbital degeneracy. It is therefore suggested that the inter-orbital fluctuation is important to understand the unconventional superconductivity in these materials.