Incommensurate Magnetic Order in the Z2 Kagome Metal GdV6Sn6
Abstract
We characterize the magnetic ground state of the topological kagome metal GdV6Sn6 via resonant X-ray diffraction. Previous magnetoentropic studies of GdV6Sn6 suggested the presence of a modulated magnetic order distinct from the ferromagnetism that is easily polarized by the application of a magnetic field. Diffraction data near the Gd-L2 edge directly resolve a c-axis modulated spin structure order on the Gd sublattice with an incommensurate wave vector that evolves upon cooling toward a partial lock-in transition. While equal moment (spiral) and amplitude (sine) modulated spin states can not be unambiguously discerned from the scattering data, the overall phenomenology suggests an amplitude modulated state with moments predominantly oriented in the ab-plane. Comparisons to the ``double-flat" spiral state observed in Mn-based RMn6Sn6 kagome compounds of the same structure type are discussed.
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