We present an investigation of the influence of low levels of chemical substitution on the magnetic ground state and Néel skyrmion lattice (SkL) state in ${\mathrm{GaV}}_4{\mathrm{S}}_{8\text{−}y}{\mathrm{Se}}_y$, where $y=0,0.1,7.9$, and 8. Muon-spin spectroscopy ($\mu \mathrm{SR}$) measurements on $y=0$ and 0.1 materials reveal the magnetic ground state consists of microscopically coexisting incommensurate cycloidal and ferromagnetic environments, whereas chemical substitution leads to the growth of localized regions of increased spin density. $\mu \mathrm{SR}$ 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.

中文翻译：

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GaV4S8-ySey中的磁性和Néel天蝎子动力学

我们目前调查低水平的化学取代对磁基态和Néelskyrmion晶格（SkL）态的影响。 ${\mathrm{病毒}}_4{\mathrm{小号}}_{8\text{-}ÿ}{硒}_{ÿ}$，在哪里 $ÿ=0，0.1，7.9$和8. Muon-spin光谱仪（$\mu \mathrm{SR}$）测量 $ÿ=0$ 0.1材料揭示了磁性基态由微观上并存的不等摆线和铁磁环境组成，而化学取代导致自旋密度增加的局部区域的增长。 $\mu \mathrm{SR}$出现的低频天文离子动力学的测量结果表明，SkL存在于序列两端的低取代水平下。在替代样品中，天空离子离子激发持续到低于平衡SkL的温度，这表明天空离子离子前体的存在范围很广。