Soft phonons reveal the nematic correlation length in Ba(Fe$_{0.94}$Co$_{0.06}$)$_2$As$_2$

F. Weber; D. Parshall; L. Pintschovius; J. -P. Castellan; M. Kauth; M. Merz; Th. Wolf; M. Schütt; J. Schmalian; R. M. Fernandes; D. Reznik

doi:10.1103/PhysRevB.98.014516

Soft phonons reveal the nematic correlation length in Ba(Fe$_{0.94}$Co$_{0.06}$)$_2$As$_2$

Superconductivity 2018-08-01 v1

Authors: F. Weber , D. Parshall , L. Pintschovius , J. -P. Castellan , M. Kauth , M. Merz , Th. Wolf , M. Schütt , J. Schmalian , R. M. Fernandes , D. Reznik

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Abstract

Nematicity is ubiquitous in electronic phases of high- $T_c$ superconductors, particularly in the Fe-based systems. While several experiments have probed nematic fluctuations, they have been restricted to uniform or momentum averaged fluctuations. Here, we investigate the behavior of finite-momentum nematic fluctuations by utilizing the anomalous softening of acoustic phonon modes in optimally doped Ba(Fe $_{0.94}$ Co $_{0.06}$ ) $_2$ As $_2$ . We determine the nematic correlation length and find that it sharply changes its $T$ -dependence at $T_c$ , revealing a strong connection between nematicity and superconductivity.

Keywords

nematicity superconductivity acoustic phonon correlation length iron-based superconductor

Cite

@article{arxiv.1806.05581,
  title  = {Soft phonons reveal the nematic correlation length in Ba(Fe$_{0.94}$Co$_{0.06}$)$_2$As$_2$},
  author = {F. Weber and D. Parshall and L. Pintschovius and J. -P. Castellan and M. Kauth and M. Merz and Th. Wolf and M. Schütt and J. Schmalian and R. M. Fernandes and D. Reznik},
  journal= {arXiv preprint arXiv:1806.05581},
  year   = {2018}
}

Soft phonons reveal the nematic correlation length in Ba(Fe$_{0.94}$Co$_{0.06}$)$_2$As$_2$

Abstract

Keywords

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