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
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.
. [J]. 中国物理快报, 2020, 37(6): 67401-.
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. Time-Resolved Study of Pseudogap and Superconducting Quasiparticle Dynamics in Ca$_{0.82}$La$_{0.18}$Fe$_{1-x}$Ni$_{x}$As$_{2}$ *. Chin. Phys. Lett., 2020, 37(6): 67401-.
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2020, Vol. 37 
