1. Optical observation of spin-density-wave fluctuations in Ba122 iron-based superconductors
- Author
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Hai-Hu Wen, Z. R. Ye, Yaomin Dai, Dorothée Colson, A. Forget, Donglai Feng, Bing Xu, Bing Shen, Ricardo P. S. M. Lobo, X. G. Qiu, H. Xiao, Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) (LPEM), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences [Changchun Branch] (CAS), Nanjing University (NJU), Fudan University [Shanghai], Laboratoire Nano-Magnétisme et Oxydes (LNO), Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, This work was supported by NSFC, Grant No. U1530402. Work at IOP CAS was supported by MOST (973 Projects No. 2015CB921303, 2015CB921102, 2012CB921302, and 2012CB821403), and NSFC (Grants No. 91121004, 91421304, and 11374345)., Center for High Pressure Science & Technology Advanced Research, Center for High Pressure Science & Technology Advanced Research (HPSTAR), Beijing National Laboratory for Condensed Matter Physics and Institute of Physics (IoP/CAS), Sorbonne Université (SU), National Laboratory of Solid State Microstructures [Nanjing University] (LSSMS), and State key laboratory of surface physics
- Subjects
PACS numbers: 72.15.-v, 74.70.-b, 78.30.-j ,FOS: Physical sciences ,02 engineering and technology ,01 natural sciences ,Optical conductivity ,Superconductivity (cond-mat.supr-con) ,Condensed Matter - Strongly Correlated Electrons ,Liquid crystal ,Condensed Matter::Superconductivity ,0103 physical sciences ,Spin density wave ,010306 general physics ,Physics ,Superconductivity ,[PHYS]Physics [physics] ,Condensed matter physics ,Strongly Correlated Electrons (cond-mat.str-el) ,Transition temperature ,Condensed Matter - Superconductivity ,Doping ,Order (ring theory) ,021001 nanoscience & nanotechnology ,Condensed Matter::Strongly Correlated Electrons ,[PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el] ,0210 nano-technology ,Energy (signal processing) - 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 $T^{\ast}$ much higher than the SDW transition temperature $T_{SDW}$. Since this behavior has the same optical feature and energy scale as the SDW order, we attribute it to SDW fluctuations. Furthermore, $T^{\ast}$ 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., Comment: 6 pages 5 figures
- Published
- 2016
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