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We present the results of a muon-spin spectroscopy investigation ofGaV$_4$S$_{8-y}$Se$_{y}$ with $y=0, 2, 4$ and 8. Zero-field measurementssuggest that GaV$_{4}$Se$_{8}$ and GaV$_{4}$S$_{8}$ have distinct magneticground states, with the latter material showing an anomaloustemperature-dependence of the local magnetic field. It is not possible toevolve the magnetic state continuously between these two systems, with theintermediate $y=2$ and $4$ materials showing glassy magnetic behaviour at lowtemperature. The skyrmion lattice (SkL) phase is evident in the $y=0$ and 8materials through an enhanced response of the muon-spin relaxation to theemergent dynamics that accompany the SkL. For our polycrystalline samples ofGaV$_4$Se$_{8}$, this enhanced dynamic response is confined to a smaller regionof the magnetic field-temperature phase diagram than the previous reports ofthe SkL in single crystals.

Magnetic phases of skyrmion-hosting GaV$_4$S$_{8-y}$Se$_{y}$ ($y = 0, 2, 4, 8$) probed with muon spectroscopy