Effect of magnetism on lattice dynamics in SrFe${}_2$As${}_2$ as seen via high resolution inelastic x-ray scattering

Abstract

Phonon spectra of detwinned {SrFe${}_2$As${}_2$} crystals, as measured by inelastic x-ray scattering, show clear anisotropy accompanying the magneto-structural transition at 200 K. We model the mode splitting using magnetic DFT calculations, including a phenomenological reduction in force-constant anisotropy that can be attributed to magnetic fluctuations. This serves as a starting point for a general model of phonons in this material applicable to both magnetic and non-magnetic phase. Using this model, the measured splitting in the magnetic phase below $T_N$, and the measured phonon linewidth, we set a lower bound on the mean magnetic fluctuation frequency above $T_N$ at 210 K.

arXiv commentAccepted for publication in Phys.Rev.B (Rapid Communications)

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• Three superconducting phases with different categories of pairing in hole- and electron-doped LaFeAs${}_{1-x}$P${}_x$O
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