Interaction-induced singular Fermi surface in a high-temperature oxypnictide superconductor.

ABSTRACT: In the family of iron-based superconductors, LaFeAsO-type materials possess the simplest electronic structure due to their pronounced two-dimensionality. And yet they host superconductivity with the highest transition temperature Tc ≈ 55K. Early theoretical predictions of their electronic structure revealed multiple large circular portions of the Fermi surface with a very good geometrical overlap (nesting), believed to enhance the pairing interaction and thus superconductivity. The prevalence of such large circular features in the Fermi surface has since been associated with many other iron-based compounds and has grown to be generally accepted in the field. In this work we show that a prototypical compound of the 1111-type, SmFe(0.92)Co(0.08)AsO , is at odds with this description and poss

SUBMITTER: Charnukha A 

PROVIDER: S-EPMC4441009 | biostudies-literature | 2015 May

REPOSITORIES: biostudies-literature