Evidence for weak electronic correlations in iron pnictides

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • W. L. Yang - , Lawrence Berkeley National Laboratory (Author)
  • A. P. Sorini - , Stanford Linear Accelerator Center (SLAC) (Author)
  • C. C. Chen - , Stanford Linear Accelerator Center (SLAC), Stanford University (Author)
  • B. Moritz - , Stanford Linear Accelerator Center (SLAC) (Author)
  • W. S. Lee - , Stanford Linear Accelerator Center (SLAC) (Author)
  • F. Vernay - , Paul Scherrer Institute (Author)
  • P. Olalde-Velasco - , Lawrence Berkeley National Laboratory, Universidad Nacional Autónoma de México (Author)
  • J. D. Denlinger - , Lawrence Berkeley National Laboratory (Author)
  • B. Delley - , Paul Scherrer Institute (Author)
  • J. H. Chu - , Stanford Linear Accelerator Center (SLAC), Stanford University (Author)
  • J. G. Analytis - , Stanford Linear Accelerator Center (SLAC), Stanford University (Author)
  • I. R. Fisher - , Stanford Linear Accelerator Center (SLAC), Stanford University (Author)
  • Z. A. Ren - , CAS - Institute of Physics (Author)
  • J. Yang - , CAS - Institute of Physics (Author)
  • W. Lu - , CAS - Institute of Physics (Author)
  • Z. X. Zhao - , CAS - Institute of Physics (Author)
  • J. Van Den Brink - , Stanford Linear Accelerator Center (SLAC), Leiden University (Author)
  • Z. Hussain - , Lawrence Berkeley National Laboratory (Author)
  • Z. X. Shen - , Stanford Linear Accelerator Center (SLAC), Stanford University (Author)
  • T. P. Devereaux - , Stanford Linear Accelerator Center (SLAC), Stanford University (Author)

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.

Details

Original languageEnglish
Article number014508
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number1
Publication statusPublished - 6 Aug 2009
Peer-reviewedYes
Externally publishedYes