# Optical observation of spin-density-wave fluctuations in Ba122 iron-based superconductors

5 LNO - Laboratoire Nano-Magnétisme et Oxydes
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
Abstract : In iron-based superconductors, a spin-density-wave (SDW) magnetic order is suppressed with doping and unconventional superconductivity appears in close proximity to the SDW instability. The optical response of the SDW order shows clear gap features: substantial suppression in the low-frequency optical conductivity, alongside a spectral weight transfer from low to high frequencies. Here, we study the detailed temperature dependence of the optical response in three different series of the Ba122 system [Ba$_{1−x}$K$_x$Fe$_2$As$_2$, Ba(Fe$_{1−x}$Co$_x$)$_2$As$_2$ and BaFe$_2$(As$_{1−x}$P$_x$)$_2$]. Intriguingly, we found that the suppression of the low-frequency optical conductivity and spectral weight transfer appear at a temperature $T^*$ much higher than the SDW transition temperature TSDW. Since this behavior has the same optical feature and energy scale as the SDW order, we attribute it to SDW fluctuations. Furthermore, $T^*$ is suppressed with doping, closely following the doping dependence of the nematic fluctuations detected by other techniques. These results suggest that the magnetic and nematic orders have an intimate relationship, in favor of the magnetic-fluctuation-driven nematicity scenario in iron-based superconductors.
Type de document :
Article dans une revue
Physical Review B : Condensed matter and materials physics, American Physical Society, 2016, 94, pp.085147. 〈10.1103/PhysRevB.94.085147〉
Domaine :
Liste complète des métadonnées

https://hal-cea.archives-ouvertes.fr/cea-01484019
Contributeur : Dominique Girard <>
Soumis le : lundi 6 mars 2017 - 16:50:42
Dernière modification le : vendredi 31 août 2018 - 09:12:33
Document(s) archivé(s) le : mercredi 7 juin 2017 - 15:34:05

### Fichier

1608.05474.pdf
Fichiers produits par l'(les) auteur(s)

### Citation

B. Xu, Y. Dai, H. Xiao, B. Shen, Z.R. Ye, et al.. Optical observation of spin-density-wave fluctuations in Ba122 iron-based superconductors. Physical Review B : Condensed matter and materials physics, American Physical Society, 2016, 94, pp.085147. 〈10.1103/PhysRevB.94.085147〉. 〈cea-01484019〉

### Métriques

Consultations de la notice

## 101

Téléchargements de fichiers