Evidence for core-hole-mediated inelastic x-ray scattering from metallic Fe${}_{1.087}$Te

Abstract

We present a detailed analysis of resonant inelastic scattering (RIXS) from Fe${}_{1.087}$Te with unprecedented energy resolution. In contrast to the sharp peaks typically seen in insulating systems at the transition metal $L_3$ edge, we observe spectra which show different characteristic features. For low energy transfer, we experimentally observe theoretically predicted many-body effects of resonant Raman scattering from a non-interacting gas of fermions. Furthermore, we find that limitations to this many-body electron-only theory are realized at high Raman shift, where an exponential lineshape reveals an energy scale not present in these considerations. This regime, identified as emission, requires considerations of lattice degrees of freedom to understand the lineshape. We argue that both observations are intrinsic general features of many-body physics of metals.

4 pages, 4 figures

References in corpus (4)

• Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity
• Evidence for weak electronic correlations in Fe-pnictides
• Fermi surface topology and low-lying quasiparticle dynamics of parent Fe${}_{1+x}$Te/Se Superconductor by orbital-polarization resolved ARPES
• Strong coupling to magnetic fluctuations in the charge dynamics of Fe-based superconductors

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