1 College of Science, Guilin University of Technology, Guilin 541004, China; 2 Key Laboratory of Low-dimensional Structural Physics and Application, Education Department of Guangxi Zhuang Autonomous Region, Guilin 541004, China; 3 Faculty of Physics, Hubei University, Wuhan 430062, China
Abstract 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 interactions. Our results show that the stabilized magnetic structure evolves with increasing hole doping level. Namely, 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 increases. At a certain doping level, energy degeneracy of different magnetic structures appears, indicating strong magnetic frustration and magnetic fluctuations in the system. We suggest that the magnetic competition induced by the hole doping may explain the fast decrease of the Neel temperature TN and the moderately suppressed magnetic moment in the hole doped Fe-pnicitides. Moreover, 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.
Fund: Project supported by the Guangxi Natural Science Foundation, China (Grant Nos. 2022GXNSFAA035560 and GuikeAD20159009) and the Scientific Research Foundation of Guilin University of Technology (Grant No. GLUTQD2017009).
Yuan-Fang Yue(岳远放), Zhong-Bing Huang(黄忠兵), Huan Li(黎欢),Xing Ming(明 星), and Xiao-Jun Zheng(郑晓军) Hole density dependent magnetic structure and anisotropy in Fe-pnictide superconductor 2023 Chin. Phys. B 32 097403
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