Paramagnon dispersion in $\beta$-FeSe observed by Fe $L$-edge resonant inelastic x-ray scattering

M. C. Rahn; K. Kummer; N. B. Brookes; A. A. Haghighirad; K. Gilmore; A. T. Boothroyd

doi:10.1103/PhysRevB.99.014505

Paramagnon dispersion in $\beta$-FeSe observed by Fe $L$-edge resonant inelastic x-ray scattering

Superconductivity 2019-01-16 v2 Strongly Correlated Electrons

Authors: M. C. Rahn , K. Kummer , N. B. Brookes , A. A. Haghighirad , K. Gilmore , A. T. Boothroyd

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Abstract

We report an Fe $L$ -edge resonant inelastic x-ray scattering (RIXS) study of the unusual superconductor $\beta$ -FeSe. The high energy resolution of this RIXS experiment ( $\approx\,$ 55 $\,$ meV FWHM) made it possible to resolve low-energy excitations of the Fe $3d$ manifold. These include a broad peak which shows dispersive trends between 100-200 $\,$ meV along the $(\pi,0)$ and $(\pi,\pi)$ directions of the one-Fe square reciprocal lattice, and which can be attributed to paramagnon excitations. The multi-band valence state of FeSe is among the most metallic in which such excitations have been discerned by soft x-ray RIXS.

Keywords

beta-fese resonant inelastic x-ray scattering paramagnon dispersion fe l-edge superconductor low-energy excitations

Cite

@article{arxiv.1808.08183,
  title  = {Paramagnon dispersion in $\beta$-FeSe observed by Fe $L$-edge resonant inelastic x-ray scattering},
  author = {M. C. Rahn and K. Kummer and N. B. Brookes and A. A. Haghighirad and K. Gilmore and A. T. Boothroyd},
  journal= {arXiv preprint arXiv:1808.08183},
  year   = {2019}
}

Paramagnon dispersion in $\beta$-FeSe observed by Fe $L$-edge resonant inelastic x-ray scattering

Abstract

Keywords

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