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首页> 外文期刊>Physical review >Spin dynamics and resonant inelastic x-ray scattering in chromium with commensurate spin-density wave order
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Spin dynamics and resonant inelastic x-ray scattering in chromium with commensurate spin-density wave order

机译：铬具有相应的自旋密度波阶的自旋动力学和共振非弹性X射线散射

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摘要

We theoretically investigate spin dynamics and L_3-edge resonant inelastic x-ray scattering (RIXS) of chromium with commensurate spin-density wave (SDW) order, based on a multiband Hubbard model composed of 3d and 4s orbitals. Obtaining the ground state with the SDW mean-field approximation, we calculate the dynamical transverse and longitudinal spin susceptibility by using random-phase approximation. We find that a collective spin-wave excitation seen in inelastic neutron scattering hardly damps up to ～0.6 eV. Above the energy, the excitation overlaps individual particle-hole excitations as expected, leading to broad spectral weight. On the other hand, the collective spin-wave excitation in RIXS spectra has a tendency to be masked by large spectral weight coming from particle-hole excitations with various orbital channels. This is in contrast with inelastic neutron scattering, where only selected diagonal orbital channels contribute to the spectral weight. However, it may be possible to detect the spin-wave excitation in RIXS experiments in the future if resolution is high enough.
机译：我们基于由3d和4s轨道组成的多波段Hubbard模型，从理论上研究了铬的自旋动力学和L_3边共振非弹性X射线散射（RIXS），具有相应的自旋密度波（SDW）阶。通过SDW平均场近似获得基态，我们使用随机相位近似计算动态的横向和纵向自旋磁化率。我们发现，在非弹性中子散射中看到的集体自旋波激发几乎不衰减至〜0.6 eV。在能量之上，激发与预期的单个粒子-空穴激发重叠，从而导致较宽的光谱权重。另一方面，RIXS光谱中的集体自旋波激发趋向于被来自具有各种轨道通道的粒子-空穴激发的大光谱权重所掩盖。这与非弹性中子散射相反，在非弹性中子散射中，只有选定的对角轨道通道有助于谱权重。但是，如果分辨率足够高，将来可能会在RIXS实验中检测自旋波激发。

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