The discovery of chiral helical magnetism (CHM) in ${\text{Cr}}_{1/3}{\text{NbS}}_2$ and the stabilization of a chiral soliton lattice has attracted considerable interest in view of their potential technological applications. However, there is an ongoing debate regarding whether the sister compound, ${\text{Mn}}_{1/3}{\text{NbS}}_2$, which shares the same crystal structure, exhibits similar nontrivial properties which likewise rely on the lack of inversion symmetry at the magnetic ion. In this study, we conduct a comprehensive investigation of the magnetically ordered states of both compounds, using ${}^{53}\mathrm{Cr}, {}^{55}\mathrm{Mn}$, and ${}^{93}\mathrm{Nb}$ NMR. Our results, supported by density-functional calculations, detect in a high-quality single crystal of ${\text{Cr}}_{1/3}{\text{NbS}}_2$ all the signatures of the monoaxial CHM in a magnetic field, identifying it as a reference case for NMR. The detailed understanding of this prototypic behavior provides a reference for ${\text{Mn}}_{1/3}{\text{NbS}}_2$. Despite the much larger density of specific defects in this second material, we confirm the presence of a CHM phase in the Mn compound, characterized by a very large critical field for the forced ferromagnetic phase ($\approx 5\mathrm{T}$ for the applied field along $c$).

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• Magnetic phase transitions
• Magnetism
• Phase diagrams
• Chiral magnets
• Transition metal dichalcogenides
• Density functional calculations
• Mean field theory
• Nuclear magnetic resonance