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Q. Huang, Y. Qiu, W. Bao, et al. Neutron-diffraction measurements of magnetic order and a structural transition in the parent BaFe2As2 compound of FeAs-based high-temperature superconductors. Phys. Rev. Lett, 2008, 101(25): Arti-cle ID 257003.

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• 标题: 局域态密度对铁基超导体能隙对称性的影响Effect of Local Density of States on the Gap Symmetry in the Fe-Based Superconductors

  作者: 叶晓山, 马幸, 刘拥军

  关键字: 能隙对称性, 自旋涨落, 局域态密度Gap Symmetry; Spin Fluctuation; Local Density of States.

  期刊名称: 《Modern Physics》, Vol.1 No.1, 2011-04-01

  摘要: 我们对解释新发现的铁基化合物中的超导体能隙对称性提出一个方案。这个方案是在赫伯德模型中研究反铁磁(AFM)自旋涨落调制的电子-电子耦合。我们发现在不同的费米面上超导能隙的对称性是不相同的，并且能隙节点的出现依赖准粒子的区域态密度（LDOS）。这个发现解释了ARPES和一些其他实验中的有争议的实验结果。 We present a scenario for the gap symmetry observed in newly discovered unconventional superconduc- tivity of Fe-based layered compound .The scenario is explored in Hubbard model including electron-electron couplings mediated by antiferromagnetic(AFM) spin fluctuation . We find that the superconducting gap symmetries are different on different Fermi surfaces and the gap node emergence depends on the local density of states(LDOS) of quasi-particles .This mechanism explains the controversial experiment results oberved in the ARPES and some transport experiments .