Raman Scattering as a Probe of Charge Nematic Fluctuations in Iron Based Superconductors

Y.-X. Yang (1) , Y. Gallais (1) , R. M. Fernandes (2) , I Paul (1) , L Chauvìère (1) , M.-A. Méasson (1) , M Cazayous (1) , A. Sacuto (1) , D. Colson (3) , A. Forget (3)

1 MPQ (UMR_7162) - Laboratoire Matériaux et Phénomènes Quantiques
2 School of Physics and Astronomy [Minneapolis]
3 LNO - Laboratoire Nano-Magnétisme et Oxydes

We report Raman scattering measurement of charge nematic fluctuations in the tetragonal phase of BaFe 2 As 2 and Sr(Fe 1−x Co x) 2 As 2 (x=0.04) single crystals. In both systems, the observed nematic fluctuations are found to exhibit divergent Curie-Weiss like behavior with very similar characteristic temperature scales, indicating a universal tendency towards charge nematic order in 122 iron-based superconductors.

Domains: Physics [physics]

Y.-X. Yang, Y. Gallais, R. M. Fernandes, I Paul, L Chauvìère, et al.. Raman Scattering as a Probe of Charge Nematic Fluctuations in Iron Based Superconductors. Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013), 2014, ⟨10.7566/JPSCP.3.015001⟩. ⟨cea-01377145⟩