Resonant inelastic x-ray scattering study of electronic excitations in 
insulating K0.83Fe1.53Se2

Gretarsson, H.; Nomura, T.; Jarrige, I.; Lupascu, A.; Upton, M.; Kim, J.; Casa, D.; Gog, T.; Yuan, R.; Chen, Z.; Wang, N.; Kim, Y.

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

Resonant inelastic x-ray scattering study of electronic excitations in insulating K_0.83Fe_1.53Se₂

MPS-Authors

Gretarsson, H.
Max Planck Society;

/persons/resource/persons279833

Casa, D.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

External Resource

No external resources are shared

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Gretarsson, H., Nomura, T., Jarrige, I., Lupascu, A., Upton, M., Kim, J., et al. (2015). Resonant inelastic x-ray scattering study of electronic excitations in insulating K_0.83Fe_1.53Se₂. Physical Review B, 91(24): 245118.

Cite as: https://hdl.handle.net/21.11116/0000-000E-CA56-E

Abstract

We report an Fe K-edge resonant inelastic x-ray scattering study of K0.83Fe1.53Se2. This material is an insulator, unlike many parent compounds of iron-based superconductors. We found a sharp excitation around 1 eV, which is resonantly enhanced when the incident photon energy is tuned near the pre-edge region of the absorption spectrum. The spectral weight and lineshape of this excitation exhibit clear momentum dependence. In addition, we observe momentum-independent broad interband transitions at higher excitation energies of 3-7 eV. Calculations based on a 70-band dp orbital model, using a moderate U-eff approximate to 2.5 eV, indicate that the similar to 1 eV feature originates from the correlated Fe 3d electrons, with a dominant d(xz) and d(yz) orbital character. We find that a moderate U-eff yields a satisfying agreement with the experimental spectra, suggesting that the electron correlations in the insulating and metallic iron-based superconductors are comparable.