Hole density dependent magnetic structure and anisotropy in Fe-pnictide superconductor

doi:10.1088/1674-1056/acd328

中国物理B ›› 2023, Vol. 32 ›› Issue (9): 97403-097403.doi: 10.1088/1674-1056/acd328

Hole density dependent magnetic structure and anisotropy in Fe-pnictide superconductor

Yuan-Fang Yue(岳远放)^1,2, Zhong-Bing Huang(黄忠兵)^3,†, Huan Li(黎欢)^1,2, Xing Ming(明星)^1,2, and Xiao-Jun Zheng(郑晓军)^1,2,‡

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

收稿日期:2023-03-27 修回日期:2023-04-26 接受日期:2023-05-06 发布日期:2023-08-28
通讯作者: Zhong-Bing Huang, Xiao-Jun Zheng E-mail:huangzb@hubu.edu.cn;xjzheng@glut.edu.cn
基金资助:
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).

Hole density dependent magnetic structure and anisotropy in Fe-pnictide superconductor

Yuan-Fang Yue(岳远放)^1,2, Zhong-Bing Huang(黄忠兵)^3,†, Huan Li(黎欢)^1,2, Xing Ming(明星)^1,2, and Xiao-Jun Zheng(郑晓军)^1,2,‡

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

Received:2023-03-27 Revised:2023-04-26 Accepted:2023-05-06 Published:2023-08-28
Contact: Zhong-Bing Huang, Xiao-Jun Zheng E-mail:huangzb@hubu.edu.cn;xjzheng@glut.edu.cn
Supported by:
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).

摘要/Abstract

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 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 T_N 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.

关键词: iron-pnictide superconductors, magnetic structure, resistivity anisotropy

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 T_N 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.

Key words: iron-pnictide superconductors, magnetic structure, resistivity anisotropy

中图分类号: (Electronic structure (photoemission, etc.))

74.25.Jb

74.70.Xa (Pnictides and chalcogenides) 71.10.Fd (Lattice fermion models (Hubbard model, etc.))

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[J]. 中国物理B, 2023, 32(9): 97403-097403.

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Hole density dependent magnetic structure and anisotropy in Fe-pnictide superconductor

Hole density dependent magnetic structure and anisotropy in Fe-pnictide superconductor

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