Fermi Surface and Band Structure of (Ca,La)FeAs2 Superconductor from Angle-Resolved Photoemission Spectroscopy

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2013,（12）
• 页码范围: 139-143
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/0256-307X/30/12/127402

摘要

The (Ca,R)FeAs2 (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 Г(0,0) and two electron-like bands near the zone corner M(π,π) in CaFeAs2.In our angle-resolved photoemission measurements on (Ca0.9La0.1)FeAs2,we have observed three holelike bands around the Г 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.