1. Fermi Surface and Band Structure of (Ca,La)FeAs2 Superconductor from Angle-Resolved Photoemission Spectroscopy.
- Author
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Xu, Liu, De-Fa, Liu, Lin, Zhao, Qi, Guo, Qing-Ge, Mu, Dong-Yun, Chen, Bing, Shen, He-Mian, Yi, Jian-Wei, Huang, Jun-Feng, He, Ying-Ying, Peng, Yan, Liu, Shao-Long, He, Guo-Dong, Liu, Xiao-Li, Dong, Jun, Zhang, Chuang-Tian, Chen, Zu-Yan, Xu, Zhi-An, Ren, and Xing-Jiang, Zhou
- Subjects
SUPERCONDUCTIVITY ,ELECTRIC conductivity ,ELECTRONIC structure ,PHOTOELECTRON spectroscopy ,FERMI surfaces ,ENERGY-band theory of solids - Abstract
The (Ca,R)FeAs
2 (R=La, Pr, etc.) superconductors with a signature of superconductivity transition above 40 K possess a new kind of block layers that consist of zig-zag As chains. We report the electronic structure of the new (Ca,La)FeAs2 superconductor investigated by both band structure calculations and high resolution angle-resolved photoemission spectroscopy measurements. Band structure calculations indicate that there are four hole-like bands around the zone center Γ(0,0) and two electron-like bands near the zone corner M(π, π) in CaFeAs2 . In our angle-resolved photoemission measurements on (Ca0.9 La0.1 )FeAs2 , we have observed three hole-like bands around the Γ point and one electron-like Fermi surface near the M(π, π) point. These results provide important information to compare and contrast with the electronic structure of other iron-based compounds in understanding the superconductivity mechanism in the iron-based superconductors. [ABSTRACT FROM AUTHOR]- Published
- 2013
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