Probing photo-induced rearrangements in the NdNiO magnetic spiral with polarization-sensitive ultrafast resonant soft x-ray scattering
arXiv:2004.06752 · doi:10.1103/PhysRevB.102.014311
Abstract
We use resonant soft X-ray diffraction to track the photo-induced dynamics of the antiferromagnetic structure in a NdNiO 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-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.
References in corpus (8)
- Ground state oxygen holes and the metal-insulator transition in the negative charge transfer rare-earth nickelates
- Bond disproportionation and dynamical charge fluctuations in the perovskite rare earth nickelates
- Role of magnetic and orbital ordering at the metal-insulator transition in NdNiO3
- Low-energy description of the metal-insulator transition in the rare-earth nickelates
- Tailoring the electronic transitions of NdNiO_3 films through (111)_pc oriented interfaces
- Complex magnetic order in nickelate slabs
- Reproducibility and off-stoichiometry issues in nickelate thin films grown by pulsed laser deposition
- Resonant inelastic x-ray scattering study of bond order and spin excitations in nickelate thin-film structures