Two-dimensionality of electronic structure and strong Fermi surface nesting in highly anisotropic iron-based superconductors

異方性の強い鉄系超伝導体の電子状態の2次元性とフェルミ面のネスティング

町田 昌彦  ; 中村 博樹  

Machida, Masahiko; Nakamura, Hiroki

We perform first-principle calculations for a newly discovered iron-based superconductor, SrScFePO, whose blocking layer is a thick perovskite-based oxide (SrScO) and compare its result with those of other typical iron-based compounds, in order to make a strategy to explore iron-based compounds with higher superconducting transition temperature . Consequently, we find that the thick blocking layer like SrScO brings about perfectly cylindrical hole and electron Fermi surfaces. This can give much better nesting condition between disconnected Fermi surfaces compared to other types of iron-based superconductor compounds.