Doping - induced Quantum Phase Transition in Sc$_{3.1}$In

Sc$_3$In is a known itinerant ferromagnet with a reported T$_{\rm{c}}~\approx~$6 K. In this talk we will show that Lu doping induces a quantum phase transition in this compound. Temperature and field - dependent magnetization measurements on (Sc$_{1-\rm{x}}$Lu$_{\rm{x}}$)$_{3.1}$In polycrystalline samples were performed, where 0 $\leq$ x $\leq$ 0.08. The 3.1 : 1 stoichiometry was chosen because it showed the highest T$_{\rm{c}}~\approx$ 10 K for x = 0 when Arrott plots were employed to determine the Curie temperature. In this study we use modified Arrott plots M$^2$ vs. (H/M)$^{1/\alpha}$. For $\alpha = 1.5$, the corresponding isotherms were linear over larger field ranges, and, for the critical composition x$_c~\approx$ 0.02, the isotherm was linear down to (M,H) = (0,0). The Curie temperature determined using this method was close to 6 K.