Superconductivity in MgB{sub}2: a case study of the 'flat band-steep band' scenario

摘要

The electronic structure of MgB{sub}2 is analyzed in terms of the "flat band-steep band" scenario for superconductivity. Good agreement between the Fermi surfaces obtained from de Haasvan Alphen measurements and from TB-LMTO and FP-LMTO calculations was achieved. The decomposed electron-phonon coupling λ(q) reveals a pronounced peak-like structure along the Γ-A and F-M directions.