Anomalous magneto-elastic coupling in Au-doped BaFe2As2

S. -F. Wu; W. -L. Zhang; L. Li; H. -B. Cao; H. -H. Kung; A. S. Sefat; H. Ding; P. Richard; G. Blumberg

doi:10.1103/PhysRevB.102.014501

Anomalous magneto-elastic coupling in Au-doped BaFe2As2

Superconductivity 2020-07-15 v1

Authors: S. -F. Wu , W. -L. Zhang , L. Li , H. -B. Cao , H. -H. Kung , A. S. Sefat , H. Ding , P. Richard , G. Blumberg

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Abstract

We used polarization-resolved Raman scattering to study magneto-elastic coupling in Ba(Fe $_{1-x}$ Au $_{x}$ ) $_2$ As $_2$ crystals as a function of light Au-doping, materials for which temperatures of the structural transition ( $T_S$ ) and of the magnetic ordering transition ( $T_N$ ) split. We study the appearance of the $A_g$ (As)phonon intensity in the $XY$ scattering geometry that is very weak just below $T_S$ , but for which the intensity is significantly enhanced below $T_N$ . In addition, the $A_g$ (As) phonon shows an asymmetric line shape below $T_N$ and an anomalous linewidth broadening upon Au-doping in the magnetic phase. We demonstrate that the anomalous behavior of the $A_g$ (As) phonon mode in the $XY$ scattering geometry can be consistently described by a Fano model involving the $A_g$ (As) phonon mode interacting with the $B_{2g}$ symmetry-like magnetic continuum in which the magneto-elastic coupling constant is proportional to the magnetic order parameter.

Keywords

magneto-elastic coupling au-doped baFe2as2 raman scattering fano model magnetic order parameter structural transition

Cite

@article{arxiv.1712.01903,
  title  = {Anomalous magneto-elastic coupling in Au-doped BaFe2As2},
  author = {S. -F. Wu and W. -L. Zhang and L. Li and H. -B. Cao and H. -H. Kung and A. S. Sefat and H. Ding and P. Richard and G. Blumberg},
  journal= {arXiv preprint arXiv:1712.01903},
  year   = {2020}
}

Anomalous magneto-elastic coupling in Au-doped BaFe2As2

Abstract

Keywords

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