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Variational Monte Carlo study of the nematic state in iron-pnictide superconductors with a five-orbital model

Chinese Physics B 2015年第1期24卷 109-113页

作者：郑晓军黄忠兵邹良剑 Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Faculty of Physics and Electronic Technology Hubei University Beijing Computational Science Research Center Department of Physics University of Science and Technology of China

We perform a variational Monte Carlo study of the nematic state in iron-pnictide superconductors within a realistic five-orbital model. Our numerical results show that the nematic state, formed by introducing an anisotropic hopping order into the projected wave function, is not stable unless the off-site Coulomb interaction V exceeds a critical value. This demonstrates that V plays a key role in forming the nematic state in iron-pnictide superconductors. In the nematic state,the orbital order and the anisotropic spin correlations are consistent with the experimental observations. We argue that the experimentally observed anisotropic magnetic couplings and structural transition are associated with the nematic state and can be understood in a unified framework.

关键词： iron-pnictide superconductors nematic state off-site Coulomb interaction variational Monte Carlo simulation

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

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中国物理B:英文版 2023年第9期32卷 463-467页

作者：岳远放黄忠兵黎欢明星郑晓军 College of Science Guilin University of TechnologyGuilin 541004China Key Laboratory of Low-dimensional Structural Physics and Application Education Department of Guangxi Zhuang Autonomous RegionGuilin 541004China Faculty of Physics Hubei UniversityWuhan 430062China

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.

关键词： iron-pnictide superconductors magnetic structure resistivity anisotropy

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