Evidence for weak electronic correlations in Fe-pnictides
Journal Article
·
· Submitted to Physical Review B
OSTI ID:979039
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 {approx}< 2eV and J {approx} 0.8eV.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 979039
- Report Number(s):
- SLAC-PUB-14006; TRN: US201010%%356
- Journal Information:
- Submitted to Physical Review B, Journal Name: Submitted to Physical Review B
- Country of Publication:
- United States
- Language:
- English
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