Anisotropic Spin Stripe Domains in Bilayer LaNiO
NK Gupta, R Gong, Y Wu, M Kang, CT Parzyck… - arXiv preprint arXiv …, 2024 - arxiv.org
arXiv preprint arXiv:2409.03210, 2024•arxiv.org
The discovery of superconductivity in La $ _3 $ Ni $ _2 $ O $ _7 $ under pressure has
motivated the investigation of a parent spin density wave (SDW) state which could provide
the underlying pairing interaction. Here, we employ resonant soft x-ray scattering and
polarimetry on thin films of bilayer La $ _3 $ Ni $ _2 $ O $ _7 $ to determine that the
magnetic structure of the SDW forms unidirectional diagonal spin stripes with moments lying
within the NiO $ _2 $ plane and perpendicular to $\mathbf {Q} _ {SDW} $, but without the …
motivated the investigation of a parent spin density wave (SDW) state which could provide
the underlying pairing interaction. Here, we employ resonant soft x-ray scattering and
polarimetry on thin films of bilayer La $ _3 $ Ni $ _2 $ O $ _7 $ to determine that the
magnetic structure of the SDW forms unidirectional diagonal spin stripes with moments lying
within the NiO $ _2 $ plane and perpendicular to $\mathbf {Q} _ {SDW} $, but without the …
The discovery of superconductivity in LaNiO under pressure has motivated the investigation of a parent spin density wave (SDW) state which could provide the underlying pairing interaction. Here, we employ resonant soft x-ray scattering and polarimetry on thin films of bilayer LaNiO to determine that the magnetic structure of the SDW forms unidirectional diagonal spin stripes with moments lying within the NiO plane and perpendicular to , but without the strong charge disproportionation typically associated with other nickelates. These stripes form anisotropic domains with shorter correlation lengths perpendicular versus parallel to , revealing nanoscale rotational and translational symmetry breaking analogous to the cuprate and Fe-based superconductors, with Bloch-like antiferromagnetic domain walls separating orthogonal domains.
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