Evidence for weak electronic correlations in iron pnictides

Academic Article

Abstract

  • Using x-ray absorption (XAS) and resonant inelastic x-ray scattering (RIXS), charge dynamics at and near the FeL edges is investigated in Fe-pnictide materials and contrasted to that measured in other Fe compounds. It is shown that the XAS and RIXS spectra for 122 and 1111 Fe pnictides are each qualitatively similar to Fe metal. Cluster diagonalization, multiplet, and density-functional calculations show that Coulomb correlations are much smaller than in the cuprates, highlighting the role of Fe metallicity and strong covalency in these materials. The best agreement with experiment is obtained using Hubbard parameters U≲2eV and J0.8eV. © 2009 The American Physical Society.
  • Digital Object Identifier (doi)

    Author List

  • Yang WL; Sorini AP; Chen CC; Moritz B; Lee WS; Vernay F; Olalde-Velasco P; Denlinger JD; Delley B; Chu JH
  • Volume

  • 80
  • Issue

  • 1