Electronic structure of LaIrIn5and f-electron character in its related Ce-115 compounds  

作　　者：Rui Zhou XueBing Luo ZhaoFeng Ding Lei Shu XingYu Ji ZiHao Zhu YaoBo Huang DaWei Shen ZhengTai Liu ZhongHao Liu Yun Zhang QiuYun Chen 

机构地区：[1]Science and Technology on Surface Physics and Chemistry Laboratory,Mianyang 621908,China [2]Department of Engineering Physics,Tsinghua University,Beijing 100084,China [3]State Key Laboratory of Surface Physics and Department of Physics,Fudan University,Shanghai 200433,China [4]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201204,China [5]Center of Excellence in Superconducting Electronics,State Key Laboratory of Functional Materials for Informatics,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2020年第11期90-97,共8页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11874330,11774320,U1630248,and 11904334);the National Key Research and Development Program of China(Grant No.2017YFA0303104);the National Key R&D Program of the MOST of China(Grant No.2016YFA0300204);the special fund from Institute of Materials,CAEP(Grant No.TP02201904);the Equipment development fund(Grant No.JZX7Y201901SY00900107);the Science Challenge Project(Grant No.TZ2016004);Part of this research used Beamline 03U of the Shanghai Synchron Radiation Facility,which is supported by ME2 project under contract No.11227902 from National Natural Science Foundation of China;supported by“Award for Outstanding Member in Youth Innovation Promotion Association CAS”。

摘　　要：LaIrIn5 is a reference compound of the heavy-fermion superconductor LaIrIn5.The lack of f electrons in LaIrIn5 indicates that there should not be any f electron participating in the construction of its Fermi surface.Thus the electronic structure comparison between LaIrIn5 and LaIrIn5 provides a good platform to study the properties of f electrons.Here angle-resolved photoemission spectroscopy(ARPES)measurements and density functional theory(DFT)calculations are performed to study the electronic structures of LaIrIn5 and LaIrIn5.We find the valence band structures of the two materials are similar to each other,except for the absence of f bands in LaIrIn5.By analyzing the Fermi crossings of the three conduction bands of the two materials quantitatively,we find the volumes of the electron pocketsαandβaround the M′point become larger from LaIrIn5 to LaIrIn5,while the hole pocketγaround theΓ′point becomes smaller.Together with the calculation results,we confirm that this is mainly originated from the f-electron contribution,while the lattice-constant difference between LaIrIn5 and LaIrIn5 only has a finite influence.We also give a summary of the f-electron character in its related Ce-115 heavy fermion compounds.Our results may be essential for the complete microscopic understanding of the 115 compounds and the related heavy-fermion systems.

关 键 词：ARPES DFT heavy fermion LaIrIn5 

分 类 号：O469[理学—凝聚态物理]