Incommensurate Magnetic Order in the ${\mathbb{Z}}_2$ Kagome Metal GdV${}_6$Sn${}_6$

Abstract

We characterize the magnetic ground state of the topological kagome metal GdV${}_6$Sn${}_6$ via resonant X-ray diffraction. Previous magnetoentropic studies of GdV${}_6$Sn${}_6$ 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-$L_2$ 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 $R$Mn${}_6$Sn${}_6$ kagome compounds of the same structure type are discussed.

5 pages, 4 figures

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• Kagome Metal GdNb${}_6$Sn${}_6$: A 4d Playground for Topological Magnetism and Electron Correlations
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• Incommensurate and commensurate antiferromagnetic orders in the kagome compound UV${}_6$Sn${}_6$
• Interplay of short-range bond order and A-type antiferromagnetic order in metallic triangular lattice GdZn${}_3$P${}_3$
• Collinear spin density wave state in distorted square-lattice GdNiSn${}_4$
• Engineering magnetic anisotropy and ferromagnetism in topological Kagome metal GdV6Sn6 via Nd substitution