Distinct behavior of electronic structure under uniaxial strain in BaFe_(2)As_(2)

作     者：李佳俊 Giao Ngoc Phan 王兴玉 杨发枝 胡全欣 贾可 赵金 刘文尧 张任杰 石友国 李世亮 钱天 丁洪 Jiajun Li;Giao Ngoc Phan;Xingyu Wang;Fazhi Yang;Quanxin Hu;Ke Jia;Jin Zhao;Wenyao Liu;Renjie Zhang;Youguo Shi;Shiliang Li;Tian Qian;Hong Ding

作者机构：Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of PhysicsUniversity of Chinese Academy of SciencesBeijing 100190China CAS Center for Excellence in Topological Quantum ComputationUniversity of Chinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials LaboratoryDongguan 523808China Tsung-Dao Lee InstituteShanghai Jiao Tong UniversityShanghai 201210China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2024年第33卷第1期

页      面：675-679页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos.11888101 and U1832202) the Chinese Academy of Sciences (Grant Nos.QYZDB-SSWSLH043,XDB28000000,and XDB33000000) the K.C.Wong Education Foundation (Grant No.GJTD-2018-01) the Informatization Plan of Chinese Academy of Sciences (Grant No.CAS-WX2021SF-0102)。 

主　　题：iron-based superconductor angle-resolved photoelectron spectroscopy uniaxial strain symmetry breaking 

摘      要：We report a study of the electronic structure of BaFe_(2)As_(2) under uniaxial strains using angle-resolved photoemission spectroscopy and transport measurements. Two electron bands at the MY point, with an energy splitting of 50 meV in the strain-free sample, shift downward and merge into each other under a large uniaxial strain, while three hole bands at theГ point shift downward together. However, we also observed an enhancement of the resistance anisotropy under uniaxial strains by electrical transport measurements, implying that the applied strains strengthen the electronic nematic order in BaFe_(2)As_(2). These observations suggest that the splitting of these two electron bands at the MY point is not caused by the nematic order in BaFe_(2)As_(2).