Resonant inelastic x-ray scattering study of charge excitations in superconducting and nonsuperconducting PrFeAsO1−y
I. Jarrige, T. Nomura, K. Ishii, H. Gretarsson, Y.-J. Kim, J. Kim, M. Upton, D. Casa, T. Gog, M. Ishikado, T. Fukuda, M. Yoshida, J. P. Hill, X. Liu, N. Hiraoka, K. D. Tsuei, S. Shamoto
DOI 10.1103/PhysRevB.86.115104 · Physical Review B
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Abstract
We report the first observation by momentum-resolved resonant inelastic x-ray scattering of charge excitations in an iron-based superconductor and its parent compound, PrFeAsO0.7 and PrFeAsO, respectively, with two main results. First, using calculations based on a 16-band dp model, we show that the energy of the lowest-lying excitations, identified as dd interband transitions of dominant xz,yz orbital character, exhibits a dramatic dependence on electron correlation. This enables us to estimate the Coulomb repulsion U and Hund's coupling J, and to highlight the role played by J in these peculiar orbital-dependent electron correlation effects. Second, we show that short-range antiferromagnetic correlations, which are a prerequisite to the occurrence of these excitations at the Γ point, are still present in the superconducting state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PrFeAsO0.7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 42 | Pressure not reported | unknown |
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