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-xRuxSi for the nominal compositions of 0 <= 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) T-tr and the effective magnetic mu(eff) moment 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 temperature theta(CW), reduced magnetic moment (of the order 10(-2) mu(B) f.u.(-1)) and linear M-H (at 2 K) in x = 0.5. Mn1-xRuxSi is found to avoid the quantum phase transition and exhibits a composition-driven magnetic to spin-glass like transition.