论文标题
探测ndnio $ _ {3} $磁性螺旋形的光诱导的重排具有极化敏感的超快谐振软X射线散射
Probing photo-induced rearrangements in the NdNiO$_{3}$ magnetic spiral with polarization-sensitive ultrafast resonant soft x-ray scattering
论文作者
论文摘要
我们使用谐振软X射线衍射来跟踪ndnio $ _ {3} $薄膜中反铁磁结构的光诱导动力学。飞秒激光脉冲具有0.61 eV的光子脉冲，在长键和短键镍位点之间具有电子转移，用于激发材料并驱动超快绝缘子 - 金属转变。极化敏感的软X射线衍射，与镍l $ _ {3} $ - 边缘共振，然后探测下面的磁螺旋的演变，这是时间延迟的函数，并通过80 picsecond Time分辨率探测。通过对不同线性X射线极化的散射强度的方位角依赖性进行建模，我们基于局部磁矩的变化和自旋对齐。测得的变化与降低长键位点磁矩的减少以及在早期延迟时旋转朝着更加共线结构的比对一致。
We use resonant soft X-ray diffraction to track the photo-induced dynamics of the antiferromagnetic structure in a NdNiO$_{3}$ thin film. Femtosecond laser pulses with a photon energy of 0.61 eV, resonant with electron transfer between long-bond and short-bond nickel sites, are used to excite the material and drive an ultrafast insulator-metal transition. Polarization sensitive soft X-ray diffraction, resonant to the nickel L$_{3}$-edge, then probes the evolution of the underlying magnetic spiral as a function of time delay with 80 picosecond time resolution. By modelling the azimuthal dependence of the scattered intensity for different linear X-ray polarizations, we benchmark the changes of the local magnetic moments and the spin alignment. The measured changes are consistent with a reduction of the long-bond site magnetic moments and an alignment of the spins towards a more collinear structure at early time delays.
