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

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.

发文机构：Science and Technology on Surface Physics and Chemistry Laboratory Department of Engineering Physics State Key Laboratory of Surface Physics and Department of Physics Shanghai Institute of Applied Physics Center of Excellence in Superconducting Electronics

关键词：ARPESDFTheavyfermionLaIrIn5

分类号： O469[理学—凝聚态物理]