Evidence for weak electronic correlations in iron pnictides

2009/05/15 by W. L. Yang, Wanli Yang, P. O. Velasco +31 · 7 citations
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #cond-mat.mtrl-sci #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.80.014508

published as Phys. Rev. B 80, 014508 (2009) [see also Physics 2, 60 (2009)] · 11 pages, 12 figures

arxiv created 2009/05/15 · openalex publication_date 2009/07/13 · arxiv updated 2010/11/03 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04

Abstract

Using x-ray absorption (XAS) and resonant inelastic x-ray scattering (RIXS), 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. The best agreement with experiment is obtained using Hubbard parameters U\ensuremath\lesssim2 eV and J\ensuremath≈0.8 eV.

Citations

• A local exchange-correlation potential for the spin polarized case. i

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• LDA+DMFTapproach to resonant inelastic x-ray scattering in correlated materials

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