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Polycrystalline members of the GaV$_4$S$_{8-y}$Se$_y$ family of materialswith small levels of substitution between $0 \leq y \leq 0.5$ and $7.5 \leqy\leq 8$ have been synthesized in order to investigate their magnetic andstructural properties. Substitutions to the skyrmion hosting parent compoundsGaV$_4$S$_8$ and GaV$_4$Se$_8$, are found to suppress the temperature of thecubic to rhombohedral structural phase transition that occurs in both endcompounds and to create a temperature region around the transition where thereis a coexistence of these two phases. Similarly, the magnitude of themagnetization and temperature of the magnetic transition are both suppressed inall substituted compounds until a glassy-like magnetic state is realized. Thereis evidence from the $ac$ susceptibility data that skyrmion lattices withsimilar dynamics to those in GaV$_4$S$_8$ and GaV$_4$Se$_8$ are present incompounds with very low levels of substitution, $0 < y< 0.2$ and $7.8 < y < 8$,however, these states vanish at higher levels of substitution. The magneticproperties of these substituted materials are affected by the substitutionaltering exchange pathways and resulting in the creation of increasinglydisordered magnetic states.

physical review materials

Structure and magnetism of the skyrmion hosting family  GaV$_4$S$_{8-y}$Se$_y$ with low levels of substitutions between $0 \leq y  \leq 0.5$ and $7.5 \leq y\leq 8$