Chin. Phys. Lett.  2020, Vol. 37 Issue (9): 097802    DOI: 10.1088/0256-307X/37/9/097802
Ultrafast Quasiparticle Dynamics and Electron-Phonon Coupling in (Li$_{0.84}$Fe$_{0.16}$)OHFe$_{0.98}$Se
Qiong Wu1,2, Huaxue Zhou1, Yanling Wu1, Lili Hu1, Shunli Ni1,2, Yichao Tian1, Fei Sun1,2, Fang Zhou1,2,3, Xiaoli Dong1,2,3, Zhongxian Zhao1,2,3, and Jimin Zhao1,2,3*
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3Songshan Lake Materials Laboratory, Dongguan 523808, China
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Qiong Wu, Huaxue Zhou, Yanling Wu et al  2020 Chin. Phys. Lett. 37 097802
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Abstract Distinctive superconducting behaviors between bulk and monolayer FeSe make it challenging to obtain a unified picture of all FeSe-based superconductors. We investigate the ultrafast quasiparticle (QP) dynamics of an intercalated superconductor (Li$_{1-x}$Fe$_{x}$)OHFe$_{1-y}$Se, which is a bulk crystal but shares a similar electronic structure with single-layer FeSe on SrTiO$_{3}$. We obtain the electron-phonon coupling (EPC) constant $\lambda_{{A}_{\rm 1g}}$ ($0.22 \pm 0.04$), which well bridges that of bulk FeSe crystal and single-layer FeSe on SrTiO$_{3}$. Significantly, we find that such a positive correlation between $\lambda_{{A}_{\rm 1g}}$ and superconducting $T_{\rm c}$ holds among all known FeSe-based superconductors, even in line with reported FeAs-based superconductors. Our observation indicates possible universal role of EPC in the superconductivity of all known categories of iron-based superconductors, which is a critical step towards achieving a unified superconducting mechanism for all iron-based superconductors.
Received: 18 July 2020      Published: 23 August 2020
PACS:  78.47.J- (Ultrafast spectroscopy (<1 psec))  
  78.47.jg (Time resolved reflection spectroscopy)  
  71.38.-k (Polarons and electron-phonon interactions)  
  74.70.-b (Superconducting materials other than cuprates)  
Fund: Supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0303603 and 2016YFA0300300), the National Natural Science Foundation of China (Grant Nos. 11574383, 11774408, and 11574370), the Frontier Program of the Chinese Academy of Sciences (Grant No. QYZDY-SSW-SLH001), the Strategic Priority Research Program of CAS (Grant No. XDB30000000), the Beijing Natural Science Foundation (Grant No. 4191003), the International Partnership Program of Chinese Academy of Sciences (Grant No. GJHZ1826), and CAS Interdisciplinary Innovation Team.
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Qiong Wu
Huaxue Zhou
Yanling Wu
Lili Hu
Shunli Ni
Yichao Tian
Fei Sun
Fang Zhou
Xiaoli Dong
Zhongxian Zhao
and Jimin Zhao
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