Magnetic behavior of Ru substituted skyrmion metal MnSi.

We report on the structural and magnetic properties of Ru substituted skyrmion metal MnSi i.e. Mn1-xRu x Si for the nominal compositions of0⩽x⩽0.5. The composition-temperature ( x-T ) phase diagram illustrates the substitution-driven changes in the magnetic behavior. It is confirmed that the magnetic ordering temperature (para-to helimagnetic)Ttrand the effective magneticμeffmoment decrease with increasing x . This indicates the suppression of magnetic order by the substitution of Ru in MnSi. However, the magnetic nature is sustained up to a concentration of about x = 0.1 above which the system exhibits spin-glass like nature as inferred from the negative Curie-Weiss temperatureθCW, reduced magnetic moment (of the order 10-2 μBf.u.-1) and linear M-H (at 2 K) in x = 0.5. Mn1-xRu x Si is found to avoid the quantum phase transition and exhibits a composition-driven magnetic to spin-glass like transition.