Evidence for weak electronic correlations in Fe-pnictides

Details Evidence for weak electronic correlations in Fe-pnictides Evidence for weak electronic correlations in Fe-pnictides

2009-05-15

arxiv.org/abs/0905.2633v1

Phys. Rev. B 80, 014508 (2009) [see also Physics 2, 60 (2009)]

Physics

Condensed Matter

Superconductivity

11 pages, 12 figures

Scientific paper

10.1103/PhysRevB.80.014508

Using x-ray absorption and resonant inelastic x-ray scattering, charge dynamics at and near the Fe $L$ 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. Best agreement with experiment is obtained using Hubbard parameters $U\lesssim 2$eV and $J\approx 0.8$eV.

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