Magnetism in $M_{1/3}$NbS${}_2$ ($M$ = Fe, V, Mn): insight into intercalated transition-metal dichalcogenides using $\mu$SR

Abstract

We present the results of muon-spin relaxation ($\mu$SR) measurements of the static and dynamic magnetism of $M_{1/3}$NbS${}_2$ ($M$ = Fe, V, Mn), three intercalated transition-metal dichalcogenides. Transitions to long-range magnetic order are observed in all three materials and local magnetic fields at muon sites are compared to dipole field calculations. Measurements on Fe${}_{1/3}$NbS${}_2$ capture the evolution of two coexisting magnetic phases. In V${}_{1/3}$NbS${}_2$ we observe a peak in the dynamic response at $9$ K, coincident with previous reports of a possible low-temperature phase transition. The observation of high-frequency muon precession in Mn${}_{1/3}$NbS${}_2$ suggests the existence of an additional muon site that implies a difference in electronic energy landscape compared to the other materials in the series. Taken together, this demonstrates that the change in intercalant species drives significant variations in magnetism, highlighting the $M_{1/3}$NbS${}_2$ ($M$ = Fe, V, Mn) series as an ideal group of materials for investigating a wide range of magnetic phenomena.

12 pages, 6 figures, submitted to PRB

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