Raman Scattering Study of the Lattice Dynamics of Superconducting LiFeAs
Y. J. Um, J. T. Park, B. H. Min, Y. J. Song, Y. S. Kwon, B. Keimer,, and M. Le Tacon
TL;DR
This study uses Raman scattering to analyze the lattice vibrations of LiFeAs, revealing phonon behaviors consistent with anharmonic decay and showing no significant electron-phonon coupling or superconductivity-related phonon anomalies.
Contribution
First Raman scattering analysis of LiFeAs lattice dynamics showing phonon modes and their temperature evolution without evidence of strong electron-phonon coupling.
Findings
Five phonon modes observed out of six expected
Phonon frequencies and linewidths follow anharmonic decay model
No superconductivity-induced phonon anomalies detected
Abstract
We report an investigation of the lattice dynamical properties of LiFeAs using inelastic light scattering. Five out of the six expected phonon modes are observed. The temperature evolution of their frequencies and linewidths is in good agreement with an anharmonic-decay model. We find no evidence for substantial electron-phonon coupling, and no superconductivity-induced phonon anomalies.
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