Optical observation of spin-density-wave fluctuations in Ba122 iron-based superconductors - Archive ouverte HAL Access content directly
Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2016

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

(1, 2) , (1) , , (3) , (4, 3) , (5) , (5) , (4) , (3) , (2) , (1)
1
2
3
4
5

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.
Fichier principal
Vignette du fichier
1608.05474.pdf (909.48 Ko) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

cea-01484019 , version 1 (06-03-2017)

Identifiers

Cite

B. Xu, Y. M. 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 (1998-2015), 2016, 94, pp.085147. ⟨10.1103/PhysRevB.94.085147⟩. ⟨cea-01484019⟩
92 View
100 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More