Anisotropic Spin Stripe Domains in Bilayer La$_3$Ni$_2$O$_7$

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 $Q_{S D W}$ , but without evidence of the strong charge disproportionation typically associated with other nickelates. These stripes form anisotropic domains with shorter correlation lengths perpendicular versus parallel to $Q_{S D W}$ , revealing nanoscale rotational and translational symmetry breaking analogous to the cuprate and Fe-based superconductors, with possible Bloch-like antiferromagnetic domain walls separating orthogonal domains.

Anisotropic Spin Stripe Domains in Bilayer La $_{3}$ Ni $_{2}$ O $_{7}$

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Anisotropic Spin Stripe Domains in Bilayer La $_{3}$ Ni $_{2}$ O $_{7}$

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Anisotropic Spin Stripe Domains in Bilayer La33​Ni22​O77​

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Anisotropic Spin Stripe Domains in Bilayer La33​Ni22​O77​

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Anisotropic Spin Stripe Domains in Bilayer La $_{3}$ Ni $_{2}$ O $_{7}$

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Anisotropic Spin Stripe Domains in Bilayer La $_{3}$ Ni $_{2}$ O $_{7}$

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