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Evolution of the neutron resonances in AFe_2Se_2

机译:AFe_2Se_2中子共振的演变

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Recent experiments on the alkali-intercalated iron selenides have raised questions about the symmetry of the superconducting phase. Random phase approximation calculations of the leading pairing eigenstate for a tight-binding 5-orbital Hubbard-Hund model of AFe_2Se_2 find that a d-wave (B_(1g)) state evolves into an extended s~± (A_(1)) state as the system is hole-doped. However, over a range of doping these two states are nearly degenerate. Here, we calculate the imaginary part of the magnetic spin susceptibility χ"(q,ω) for these gaps and discuss how the evolution of neutron scattering resonances can distinguish between them.
机译:最近对碱插入的硒化铁的实验提出了有关超导相对称性的问题。 AFe_2Se_2的紧束缚5轨道Hubbard-Hund模型的超前配对本征态的随机相位近似计算发现d波(B_(1g))状态演化为扩展s〜±(A_(1))状态因为系统是空穴掺杂的。然而,在掺杂的范围内,这两种状态几乎退化。在这里,我们计算这些间隙的磁自旋磁化率χ“(q,ω)的虚部,并讨论中子散射共振的演化如何区分它们。

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