2007/08/31 by Zi-Jian Yao, Zi‐Jian Yao, Jian-Xin Li +2 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.76.212506
published as Phys. Rev. B 76, 212506 (2007) · 5 pages, 5 figures
openalex publication_date 2007/12/19 · arxiv created 2008/03/16 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Based on a single-band Hubbard model and the fluctuation exchange approximation, the effective mass and the energy band renormalization in Na0.33CoO2 is elaborated. The renormalization is observed to exhibit certain kind of anisotropy, which agrees qualitatively with the angle-resolved photoemission spectroscopy measurements. Moreover, the spectral function and density of states in the normal state are calculated, with a weak pseudogap behavior being seen, which is explained as a result of the strong Coulomb correlations. Our results suggest that the large Fermi surface associated with the a1g band plays likely a central role in the charge dynamics.