Disorder-induced critical exponents near a ferromagnetic quantum critical point in Mn1−xCrxSi

We report the observation of critical behavior in $\mathrm{M}{\mathrm{n}}_{1\ensuremath{-}x}\mathrm{C}{\mathrm{r}}_x\mathrm{Si}(0\ensuremath{\le}x\ensuremath{\le}\phantom{\rule{0.16em}{0ex}}1)$ close to a $T=0\phantom{\rule{4pt}{0ex}}\mathrm{K}$ quantum critical point, consistent with the Belitz-Kirkpatrick-Vojta (BKV) theory of disordered metallic ferromagnets. The critical exponents are in good agreement with the theoretical predictions of the BKV theory in the preasymptotic limit. A non-Fermi liquidlike behavior is seen down to 200 mK in the transport and thermodynamic properties around the critical concentration ${x}_{\mathrm{C}}=0.2$. Quantum criticality and self-consistency of the exponents is further confirmed using a scaling analysis of the magnetization and heat capacity data. A recovery to Fermi liquidlike behavior is displayed on moving away from the critical composition, as well as with the application of a magnetic field.