电子关联对Ba $_{0.75}$ K $_{0.25}$ Fe $_{2}$ As $_{2}$自旋激发带宽的影响
Effect of electron correlations on spin excitation bandwidth in Ba$_{0.75}$K$_{0.25}$Fe$_{2}$As$_{2}$ as seen via time-of-flight inelastic neutron scattering
摘要：
利用非弹性中子散射（INS）研究了铁基超导体Ba $_{0.75}$ K $_{0.25}$ Fe $_{2}$ As $_{2}$中电子关联对自旋动力学的影响.我们的INS数据显示自旋波般的色散特性，与200毫电子伏的区域边界能量。动态自旋磁化率的第一原理分析，结合质量重整化因子为3，确定角分辨光电子能谱，提供了一个合理的描述所观察到的自旋激发。该分析表明，Fe-3 $d$带中的电子关联产生增强的有效电子质量，并因此引起自旋激发带宽的显著变窄。我们的研究结果突出了电子关联的重要性，在巡回描述的自旋激发铁基超导体。
英文摘要：
We use inelastic neutron scattering (INS) to investigate the effect of electron correlations on spin dynamics in the iron-based superconductor Ba$_{0.75}$K$_{0.25}$Fe$_{2}$As$_{2}$. Our INS data show a spin-wave-like dispersive feature, with a zone boundary energy of 200 meV. A first principles analysis of dynamical spin susceptibility, incorporating the mass renormalization factor of 3, as determined by angle-resolved photoemission spectroscopy, provides a reasonable description of the observed spin excitations. This analysis shows that electron correlations in the Fe-3$d$ bands yield enhanced effective electron masses, and consequently, induce substantial narrowing of the spin excitation bandwidth. Our results highlight the importance of electron correlations in an itinerant description of the spin excitations in iron-based superconductors.
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