Time-Resolved Study of Pseudogap and Superconducting Quasiparticle Dynamics in Ca0.82La0.18Fe1-xNixAs2  

作　　者：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 姜聪颖;宋海英;谢涛;刘畅;罗会仟;赵时中;张秀;聂需辰;孟建桥;段玉霞;刘海云;刘世炳(Strong-Field and Ultrafast Photonics Lab,Beijing Engineering Research Center of Laser Technology,Institute of Laser Engineering,Beijing University of Technology,Beijing 100124,China;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China;Songshan Lake Materials Laboratory,Dongguan 523808,China;School of Physics and Electronics,Central South University,Changsha 410083,China;Beijing Academy of Quantum Information Sciences,Beijing 100193,China)

机构地区：[1]Strong-Field and Ultrafast Photonics Lab,Beijing Engineering Research Center of Laser Technology,Institute of Laser Engineering,Beijing University of Technology,Beijing 100124,China [2]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [3]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China [4]Songshan Lake Materials Laboratory,Dongguan 523808,China [5]School of Physics and Electronics,Central South University,Changsha 410083,China [6]Beijing Academy of Quantum Information Sciences,Beijing 100193,China

出　　处：《Chinese Physics Letters》2020年第6期86-89,共4页中国物理快报（英文版）

基　　金：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)。

摘　　要：We use femtosecond time-resolved optical reflectivity to study the photoexcited quasiparticle(QP)dynamics in the iron-based 112 type superconducting(SC)samples Ca0.82La0.18Fe1-xNixAs2,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 Tms≈50 K and the SC transition Tc≈33 K,respectively.The latter obviously corresponds to an SC QP dynamics,which is further confirmed in the x=0.024 sample with Tc≈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.

关 键 词：transition. RELAXATION EXCITED 

分 类 号：O469[理学—凝聚态物理]