Time-Resolved Study of Pseudogap and Superconducting Quasiparticle Dynamics in Ca$_{0.82}$La$_{0.18}$Fe$_{1-x}$Ni$_{x}$As$_{2}$

doi:10.1088/0256-307X/37/6/067401

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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.

收稿日期: 2020-03-03 出版日期: 2020-05-26

:	74.25.Dw	(Superconductivity phase diagrams)
	78.47.J-	(Ultrafast spectroscopy (<1 psec))
	74.25.Gz	(Optical properties)
	75.30.Fv	(Spin-density waves)

引用本文:

. [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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https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/37/6/067401 或 https://cpl.iphy.ac.cn/CN/Y2020/V37/I6/67401

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