论文标题
轨道选择性自旋波
Orbital-selective spin waves in detwinned NaFeAs
论文作者
论文摘要
轨道依赖性电子相关的存在已被认为是描述铁基超导体物理学的重要成分。 Nafeas是基于铁的超导体的父母，表现出低于$ t_s \约60 $ k的四方到正晶的晶格失真，形成了一个电子列相，具有两个90 $^\ circ $旋转（twinned）域，并订购了抗fifermagnet and to ant $ t_n \ t_n \ y y 42 $ k.，以下是$ 42 $ k..单轴压力透射的nafeas。 By comparing the data with combined density functional theory and dynamical mean-field theory calculations, we conclude that spin waves up to an energy scale of $E_\text{crossover} \approx 100$ meV are dominated by $d_{yz}$-$d_{yz}$ intra-orbital scattering processes, which have the two-fold ($C_2$) rotational symmetry of the underlying lattice.另一方面，$ e_ \ text {crossover} $上方的自旋波激发大约具有四倍（$ c_4 $）旋转对称性，源自$ d_ {xy} $ - $ d_ {xy} $ d_ {xy} $ d_ {xy} $ ofera inta-orbital-orbital散射，控制了本材料中整体磁性带的整体磁性带。此外，我们发现低能（$ e \ 6 $ meV）的旋转激发从大约$ c_4 $变为$ c_2 $旋转对称性低于温度$ t^\ ast $（$> t_s $），而旋转激发的旋转激发在$ e_ \ e_ e_ \ e_ \ e_ \ e_ \ ex crossover} $ symerty y symertional and Sumptiate usations usations usitation and co_4 and co_4均为旋转率和旋转。这些结果与角度分辨的光发射光谱测量相一致，在该测量值的情况下，要在$ t_s $的上方观察到的轨道依赖性带拆分到$ t_s $上的可观察到的轨道依赖性划分的单轴应变也提高了质量符号的开始温度$ t^\ ast $，从而支持了轨道选择性旋转波的Nematic Supercard supercard supercard supercard supercard supercards of inem supercard of inem supercard supercard of inem supercard supercard of。
The existence of orbital-dependent electronic correlations has been recognized as an essential ingredient to describe the physics of iron-based superconductors. NaFeAs, a parent compound of iron based superconductors, exhibits a tetragonal-to-orthorhombic lattice distortion below $T_s\approx 60$ K, forming an electronic nematic phase with two 90$^\circ$ rotated (twinned) domains, and orders antiferromagnetically below $T_N\approx 42$ K. We use inelastic neutron scattering to study spin waves in uniaxial pressure-detwinned NaFeAs. By comparing the data with combined density functional theory and dynamical mean-field theory calculations, we conclude that spin waves up to an energy scale of $E_\text{crossover} \approx 100$ meV are dominated by $d_{yz}$-$d_{yz}$ intra-orbital scattering processes, which have the two-fold ($C_2$) rotational symmetry of the underlying lattice. On the other hand, the spin wave excitations above $E_\text{crossover}$, which have approximately fourfold ($C_4$) rotational symmetry, arise from the $d_{xy}$-$d_{xy}$ intra-orbital scattering that controls the overall magnetic bandwidth in this material. In addition, we find that the low-energy ($E\approx 6$ meV) spin excitations change from approximate $C_4$ to $C_2$ rotational symmetry below a temperature $T^\ast$ ($>T_s$), while spin excitations at energies above $E_\text{crossover}$ have approximate $C_4$ rotational symmetry and are weakly temperature dependent. These results are consistent with angle resolved photoemission spectroscopy measurements, where the presence of an uniaxial strain necessary to detwin NaFeAs also raises the onset temperature $T^\ast$ of observable orbital-dependent band splitting to above $T_s$, thus supporting the notion of orbital selective spin waves in the nematic phase of iron-based superconductors.
