Chin. Phys. Lett.  2020, Vol. 37 Issue (6): 067401    DOI: 10.1088/0256-307X/37/6/067401
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Time-Resolved Study of Pseudogap and Superconducting Quasiparticle Dynamics in Ca$_{0.82}$La$_{0.18}$Fe$_{1-x}$Ni$_{x}$As$_{2}$
Cong-Ying Jiang1, Hai-Ying Song1, T. Xie2,3, C. Liu2,3, H. Q. Luo2,4, S. Z. Zhao1, Xiu Zhang1, X. C. Nie1, Jian-Qiao Meng5, Yu-Xia Duan5, H. Y. Liu1,6**, Shi-Bing Liu1**
1Strong-Field and Ultrafast Photonics Lab, Beijing Engineering Research Center of Laser Technology, Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China
2Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
3School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
4Songshan Lake Materials Laboratory, Dongguan 523808, China
5School of Physics and Electronics, Central South University, Changsha 410083, China
6Beijing Academy of Quantum Information Sciences, Beijing 100193, China
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Cong-Ying Jiang, Hai-Ying Song, T. Xie et al  2020 Chin. Phys. Lett. 37 067401
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Abstract We use femtosecond time-resolved optical reflectivity to study the photoexcited quasiparticle (QP) dynamics in the iron-based 112 type superconducting (SC) samples Ca$_{0.82}$La$_{0.18}$Fe$_{1-x}$Ni$_{x}$As$_{2}$, with $x = 0$ and 0.024. In the parent sample, a fast and a slow relaxation emerge at temperatures below the magnetic-structure (MS) transition $T_{\rm ms} \approx 50$ K and the SC transition $T_{\rm c} \approx 33$ K, respectively. The latter obviously corresponds to an SC QP dynamics, which is further confirmed in the $x = 0.024$ sample with $T_{\rm c} \approx 25$ K. The former suggests that a partial of photoexcited QP relaxation through a pesudogap (PG) channel, which is absent in the doped $x = 0.024$ sample without the MS transition.
Received: 03 March 2020      Published: 26 May 2020
PACS:  74.25.Dw (Superconductivity phase diagrams)  
  78.47.J- (Ultrafast spectroscopy (<1 psec))  
  74.25.Gz (Optical properties)  
  75.30.Fv (Spin-density waves)  
Fund: *Supported by the National Natural Science Foundation of China (Grant Nos. 51875009 and 51705006), the Key Project of Beijing Municipal Natural Science Foundation and Beijing Education Committee's Science and Technology Plan (Grant Nos. KZ201710005004 and KZ201810005001).
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http://cpl.iphy.ac.cn/10.1088/0256-307X/37/6/067401       OR      http://cpl.iphy.ac.cn/Y2020/V37/I6/067401
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Cong-Ying Jiang
Hai-Ying Song
T. Xie
C. Liu
H. Q. Luo
S. Z. Zhao
Xiu Zhang
X. C. Nie
Jian-Qiao Meng
Yu-Xia Duan
H. Y. Liu
Shi-Bing Liu
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