维普中文期刊产品整合服务

Surface morphology and electronic structure in stoichiometric superconductor CaKFe_(4)As_(4) robed by scanning tunneling microscopy/spectroscopy

查看全文 作　　者：Xiaodong [1,2]Yu;Zhongxu [1,2]Wei;Zhanyi [1,2]Zhao;Tao [1,2]Xie;Chang [1,2]Liu;Ge [3]He;Qihong [1,2]Chen;Lei [4]Shan;Huiqian [1,5]Luo;Qing [1,5]Huan;Jie [1,5]Yuan;Kui [1,2,5]Jin 高影响力作者 机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;[2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;[3]Walther Meissner Institute,Bayerische Akademie der Wissenschaften,Garching 85748,Germany;[4]Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education,Institutes of Physical Science and Information Technology,Anhui University,Hefei 230601,China;[5]Songshan Lake Materials Laboratory,Dongguan 523808,China高影响力机构 出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2021年第64卷第12期,共7页高影响力期刊 基　　金：supported by the National Key Basic Research Program of China(Grant Nos.2017YFA0302902,2016YFA0300301,2017YFA0303003,and 2018YFB0704102);the National Natural Science Foundation of China(Grant Nos.11927808,11834016,118115301,119611410,11961141008,11822411,and 11961160699);the Key Research Program of Frontier Sciences,Chinese Academy of Sciences(Grant Nos.QYZDBSSW-SLH008,and QYZDY-SSW-SLH001);the Strategic Priority Research Program(B)of Chinese Academy of Sciences(Grant Nos.XDB25000000,and XDB33000000);the Beijing Natural Science Foundation(Grant Nos.Z190008,and JQ19002);the Key-Area Research and Development Program of Guangdong Province(Grant No.2020B0101340002);the CAS Interdisciplinary Innovation Team;support from the Youth Innovation Promotion Association of CAS(Grant No.Y202001)。 摘　　要：CaKFe_(4)As_(4) is a new-type superconductor with a relatively high transition temperature of 35 K among stoichiometric iron-based superconductors. Based on scanning tunneling microscopy/spectroscopy, the surface morphology and electronic structure of CaKFe_(4)As_(4) single crystal were systematically investigated. The cleaved CaKFe_(4)As_(4) showed various morphologies, such as atomically resolved 1×1, 1×2, and √2×√2 lattices. By analyzing the geometrical correlations of these morphologies, the 1×1 and 1×2 lattices were identified as the original and reconstructed As layers, respectively, whereas the √2×√2 lattice was distinguished as the reconstructed alkaline-earth-metal or alkali-metal layer. The superconducting energy gap of 7.3 me V and bosonic mode of 12.7 me V were resolved in the scanning tunneling spectra. In addition, the superconducting energy gaps measured on different terminations were identical and consistent with the values obtained by bulk-sensitive techniques, indicating that the electronic structures of CaKFe_(4)As_(4) were insensitive to the surface reconstructions. Our study clarifies the relationships between complex surface reconstructions and surface terminations and preliminarily presents that there is no obvious effect of surface reconstructions on electronic states. 关 键 词：CaKFe_(4)As_(4) scanning tunneling microscopy surface reconstructions SUPERCONDUCTIVITY
相关文献

参考文献(52)

引证文献(5)

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1　渝公网安备 50019002500403号　违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费