The non-collinear antiferromagnet Mn₃Sn shows large spontaneous time-reversal odd responses [1-4] in the inverse triangular spin structure state, which are considered to be signatures of Weyl nodes near the Fermi energy [5]. Mn₃Sn single crystals are known to be stable in the presence of excess manganese atoms. Depending on the composition, three distinct magnetic phases can be realized as a function of temperature, namely the high temperature triangular spin structure phase (q =0), the intermediate-temperature helical phase (q ≠ 0), and the low-temperature cluster spin glass phase [7]. Here we present our study on the compositional dependence of Mn_3-xSn_1-x and discuss the systematic evolution of the three magnetic phases in Mn₃Sn based on transport and magnetic properties.

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