Nickelate material shows how spin stripes form at high temperatures

Researchers from The Chinese University of Hong Kong and Stanford University/SLAC National Accelerator Laboratory have identified the origin of diagonal spin stripes within the bilayer nickelate La₃Ni₂O₇, a material recently recognized as a high-temperature superconductor. The work demonstrates that (π/2,π/2) spin stripe order arises in their model with sizable Hund's coupling J_H from a hidden quasi-one dimensionality and persists over a range of electron concentrations. The results pinpoint interlayer coupling J_⊥ as a key factor enhancing pairing tendencies when the interlayer antiferromagnetic coupling J_⊥ becomes sufficiently large, providing a microscopic understanding of magnetic order within La₃Ni₂O₇. La₃Ni₂O₇, a bilayer nickelate material, recently demonstrated superconductivity with transition…