Hole density dependent magnetic structure and anisotropy in Fe-pnictide superconductor
作者机构：College of ScienceGuilin University of TechnologyGuilin 541004China Key Laboratory of Low-dimensional Structural Physics and ApplicationEducation Department of Guangxi Zhuang Autonomous RegionGuilin 541004China Faculty of PhysicsHubei UniversityWuhan 430062China
出 版 物：《中国物理B:英文版》 (Chinese Physics B)
年 卷 期：2023年第32卷第9期
页 面：463-467页
核心收录：
学科分类：07[理学] 070205[理学-凝聚态物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学]
基 金：the Guangxi Natural Science Foundation,China(Grant Nos.2022GXNSFAA035560and GuikeAD20159009) the Scientific Research Foundation of Guilin University of Technology(Grant No.GLUTQD2017009)
主 题：iron-pnictide superconductors magnetic structure resistivity anisotropy
摘 要：The competition between different magnetic structures in hole-doped Fe-pnicitides is explored based on an extended five-orbital Hubbard model including long-range Coulomb *** results show that the stabilized magnetic structure evolves with increasing hole doping ***,the stripe antiferromagnetic phase dominates at zero doping,while magnetic structures with more antiferromagnetic linking numbers such as the staggered tetramer,staggered trimer,and staggered dimer phases become energetically favorable as the hole density *** a certain doping level,energy degeneracy of different magnetic structures appears,indicating strong magnetic frustration and magnetic fluctuations in the *** suggest that the magnetic competition induced by the hole doping may explain the fast decrease of the Neel temperature TNand the moderately suppressed magnetic moment in the hole doped ***,our results show a sign reversal of the kinetic energy anisotropy as the magnetic ground state evolves,which may be the mechanism behind the puzzling sign reversal of the in-plane resistivity anisotropy in hole-doped Fe-pnicitides.
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