Signatures of polarized chiral spin disproportionation in rare earth nickelates.

ABSTRACT: In rare earth nickelates (RENiO₃), electron-lattice coupling drives a concurrent metal-to-insulator and bond disproportionation phase transition whose microscopic origin has long been the subject of active debate. Of several proposed mechanisms, here we test the hypothesis that pairs of self-doped ligand holes spatially condense to provide local spin moments that are antiferromagnetically coupled to Ni spins. These singlet-like states provide a basis for long-range bond and spiral spin order. Using magnetic resonant X-ray scattering on NdNiO₃ thin films, we observe the chiral nature of the spin-disproportionated state, with spin spirals propagating along the crystallographic (101)_ortho direction. These spin spirals are found to preferentially couple to X-ra

SUBMITTER: Li J 

PROVIDER: S-EPMC11358138 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature