Magnetism and Néel skyrmion dynamics in GaV${}_4$S${}_{8-y}$Se${}_y$

Abstract

We present an investigation of the influence of low-levels of chemical substitution on the magnetic ground state and N{\' e}el skyrmion lattice (SkL) state in GaV${}_4$S${}_{8-y}$Se${}_y$, where $y=0,0.1,7.9$, and $8$. Muon-spin spectroscopy ($\mu$SR) measurements on $y=0$ and 0.1 materials reveal the magnetic ground state consists of microscopically coexisting incommensurate cycloidal and ferromagnetic environments, while chemical substitution leads to the growth of localized regions of increased spin density. $\mu$SR measurements of emergent low-frequency skyrmion dynamics show that the SkL exists under low-levels of substitution at both ends of the series. Skyrmionic excitations persist to temperatures below the equilibrium SkL in substituted samples, suggesting the presence of skyrmion precursors over a wide range of temperatures.

arXiv comment6 pages, 4 figures

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Cited by in corpus (8)

• Experimental signatures of quantum and topological states in frustrated magnetism
• Megahertz dynamics in skyrmion systems probed with muon-spin relaxation
• Anisotropic skyrmion and multi-$q$ spin dynamics in centrosymmetric Gd${}_2$PdSi${}_3$
• Pinning of Helimagnetic Phase Transitions in Zn-Substituted Skyrmion Host Cu${}_2$OSeO${}_3$
• Field-orientation-dependent magnetic phases in GdRu${}_2$Si${}_2$ probed with muon-spin spectroscopy
• Investigation of the magnetic ground state of GaV${}_4$S${}_8$ using powder neutron diffraction
• Spin dynamics in bulk MnNiGa and Mn${}_{1.4}$Pt${}_{0.9}$Pd${}_{0.1}$Sn investigated by muon spin relaxation
• Structure and magnetism of the skyrmion hosting family GaV${}_4$S${}_{8-y}$Se${}_y$ with low levels of substitutions between $0\le y\le 0.5$ and $7.5\le y\le 8$