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<p>The discovery of superconductivity in La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> 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<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> to determine that the magnetic structure of the SDW forms unidirectional diagonal spin stripes with moments lying within the NiO<sub>2</sub> plane and perpendicular to <i>Q</i><sub>SDW</sub>, 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 <i>Q</i><sub>SDW</sub>, 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.</p>

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Anisotropic spin stripe domains in bilayer La3Ni2O7

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月16日

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  • Naman K. Gupta,
  • Rantong Gong,
  • Yi Wu,
  • Mingu Kang,
  • Christopher T. Parzyck,
  • Benjamin Z. Gregory,
  • Noah Costa,
  • Ronny Sutarto,
  • Suchismita Sarker,
  • Andrej Singer,
  • Darrell G. Schlom,
  • Kyle M. Shen,
  • David G. Hawthorn

摘要

The discovery of superconductivity in La3Ni2O7 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 La3Ni2O7 to determine that the magnetic structure of the SDW forms unidirectional diagonal spin stripes with moments lying within the NiO2 plane and perpendicular to QSDW, 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 QSDW, 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.