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Nonmagnetic impurity effects and neutron scattering spectrum in iron pnictides

机译:铁素化物中的非磁性杂质效应和中子散射谱

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摘要

We study the effect of local impurity and the neutron scattering spectrum based on the five-orbital model obtained by the first principle calculation for iron pnictides. We find that the interband impurity scattering is induced by the complex multiorbital structure. This fact means that the fully-gapped sign-reversing s-wave state, which is predicted by spin-fluctuation theories, is very fragile against impurities. The result suggests a reasonable possibility that the fully-gapped s-wave state without sign reversal (s_(++)-wave) would be realized in dirty iron pnictides. We also find that broad peak structure observed in the neutron scattering measurements can be explained by the s_(++)-wave state.
机译:我们基于通过第一原理计算得到的五价铁模型,研究了局部杂质和中子散射谱的影响。我们发现带间杂质散射是由复杂的多轨道结构引起的。这一事实意味着,由自旋涨落理论预测的,带正负号的s反转的s波状态对杂质非常脆弱。结果表明,在肮脏的铁剂中可以实现无符号反转(s _(++)-wave)的完全间隙s波状态的合理可能性。我们还发现,在中子散射测量中观察到的宽峰结构可以用s _(++)波状态解释。

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