Singh Dheeraj Kumar
Harish-Chandra Research Institute, Chhatnag Road, Jhunsi, Allahabad 211019, India. Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400085, India.
J Phys Condens Matter. 2017 Oct 18;29(41):415601. doi: 10.1088/1361-648X/aa7e13. Epub 2017 Sep 4.
We investigate spin-wave excitations in the spin-density wave state of doped iron pnictides within a five-orbital model. We find that the excitations along ([Formula: see text]) → ([Formula: see text]) are very sensitive to dopings whereas they do not exhibit a similar sensitivity along ([Formula: see text]) → ([Formula: see text]). Secondly, the ellipticity of the elliptical ring-like excitations around ([Formula: see text]) is also very much dependent on doping. Thirdly, the spin-wave spectral weight shifts towards the low-energy region as it moves away from zero doping. We find several features to be in qualitative agreement with the inelastic neutron-scattering measurements for the doped pnictides.
我们在一个五轨道模型中研究了掺杂铁基氮化物自旋密度波态中的自旋波激发。我们发现，沿（[公式：见正文]）→（[公式：见正文]）方向的激发对掺杂非常敏感，而沿（[公式：见正文]）→（[公式：见正文]）方向则没有表现出类似的敏感性。其次，围绕（[公式：见正文]）的椭圆环状激发的椭圆率也很大程度上取决于掺杂。第三，自旋波谱权重随着远离零掺杂而向低能区域移动。我们发现几个特征与掺杂铁基氮化物的非弹性中子散射测量结果在定性上一致。
