Robustness of the unidirectional stripe order in the kagome superconductor CsV_(3)Sb_(5)  

作　　者：Bin Hu Yuhan Ye Zihao Huang Xianghe Han Zhen Zhao Haitao Yang Hui Chen Hong-Jun Gao 胡彬;耶郁晗;黄子豪;韩相和;赵振;杨海涛;陈辉;高鸿钧(Institute of Physics and University of Chinese Academy of Sciences,Chinese Academy of Sciences,Beijing 100190,China;CAS Center for Excellence in Topological Quantum Computation,Beijing 100190,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[1]Institute of Physics and University of Chinese Academy of Sciences,Chinese Academy of Sciences,Beijing 100190,China [2]CAS Center for Excellence in Topological Quantum Computation,Beijing 100190,China [3]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Chinese Physics B》2022年第5期15-20,共6页中国物理B（英文版）

基　　金：financially supported by the National Key Research and Development Project of China(Grant Nos.2018YFA0305800 and 2019YFA0308500);the National Natural Science Foundation of China(Grant Nos.61888102and 52022105);the Strategic Priority Research Program of Chinese Academy of Sciences(Grant Nos.XDB30000000 and XDB28000000);CAS Project for Young Scientists in Basic Research(Grant No.YSBR-003);the University of Chinese Academy of Sciences。

摘　　要：V-based kagome materials AV_(3)Sb_(5)(A=K,Rb,Cs)have attracted much attention due to their novel properties such as unconventional superconductivity,giant anomalous Hall effect,charge density wave(CDW)and pair density wave.Except for the 2a_(0)×2a_(0)CDW(charge density wave with in-plane 2×2 superlattice modulation)in AV_(3)Sb_(5),an additional 1×4(4a_(0))unidirectional stripe order has been observed at the Sb surface of Rb V3 Sb5 and CsV_(3)Sb_(5).However,the stability and electronic nature of the 4a_(0) stripe order remain controversial and unclear.Here,by using low-temperature scanning tunneling microscopy/spectroscopy(STM/S),we systematically study the 4a_(0) stripe order on the Sb-terminated surface of CsV_(3)Sb_(5).We find that the 4a_(0) stripe order is visible in a large energy range.The STM images with positive and negative bias show contrast inversion,which is the hallmark for the Peierls-type CDW.In addition,below the critical temperature about 60 K,the 4a_(0)stripe order keeps unaffected against the topmost Cs atoms,point defects,step edges and magnetic field up to 8 T.Our results provide experimental evidences on the existence of unidirectional CDW in CsV_(3)Sb_(5).

关 键 词：CsV_(3)Sb_(5) 4_(a0)stripe charge order scanning tunneling microscopy/spectroscopy charge density wave 

分 类 号：O469[理学—凝聚态物理]