Raman scattering study of NaFe$_{0.53}$Cu$_{0.47}$As

TL;DR

This study employs polarization-resolved Raman scattering to analyze lattice vibrations in NaFe$_{0.53}$Cu$_{0.47}$As, revealing phonon modes consistent with stripe order and indicating weak electron-phonon interactions.

Contribution

It provides detailed phonon mode identification and confirms stripe order in NaFe$_{0.53}$Cu$_{0.47}$As using Raman spectroscopy.

Findings

Identified 4 $A_{1g}$ phonon modes at 125, 172, 183, 197 cm$^{-1}$

Identified 4 $B_{3g}$ phonon modes at 101, 138, 173, 226 cm$^{-1}$

Phonon spectra suggest weak electron-phonon and magneto-elastic interactions.

Abstract

We use polarization-resolved Raman scattering to study lattice dynamics in NaFe$_{0.53}$Cu$_{0.47}$As single crystals. We identify 4 $A_{1g}$ phonon modes at 125, 172, 183 and 197 cm$^{-1}$, and 4 $B_{3g}$ phonon modes at 101, 138, 173, 226 cm$^{-1}$. The phonon spectra are consistent with the $Ibam$ group, which confirms that the Cu and Fe atoms form a stripe order. The temperature dependence of the phonon spectra suggests weak electron-phonon and magneto-elastic interactions.