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The entropic signatures of magnetic phase transitions in the skyrmion latticehost compounds MnSi0.962Al0.038 and Fe0.7Co0.3Si were investigated through lowfield magnetization and ac susceptibility measurements. These data indicatethat the conical to skyrmion transition that occurs with the application ofmagnetic field in MnSi0.962Al0.038 is characterized by clear discontinuity inthe magnetic entropy as expected for first order topological phase transition.These same magnetoentropic features are negligibly small in isostructuralFe0.7Co0.3Si due to the level of chemical substitution related disorder anddifferences in the spin dynamics (range and timescales). Despite the obvioussimilarities in the magnetic structures of these two compounds, the transitionsbetween these phases is substantially different indicating a surprisingnon-universality to the magnetic phase transitions in this class of materials.

Entropic signatures of the skyrmion lattice phase in MnSi1-xAlx and Fe1-yCoySi