HfFe$_{1-x}$Ru$_x$Ga$_2$, Candidate for Ferromagnetic Quantum Criticality

We present a study of the magnetic and thermodynamic properties of HfFe$_{1-x}$Ru$_x$Ga$_2$ single crystals grown using flux techniques. Having found a low temperature ferromagnetic intermetallic compound HfFeGa$_2$ we try to suppress the Curie Temperature (T$_c$) by doping with Ru as a means to investigate the evolution of critical phenomena and perhaps realize a ferromagnetic quantum critical point (QCP). Magnetization measurements have shown changes in T$_c$ of HfFe$_{1-x} $Ru$_x$Ga$_2$ from approximately $48$K to below $1.8$K as a function of Ru concentration (x). We will show recent data as well as discuss the development of the spontaneous moment (m$_0 $), susceptibility \textbf{$\chi$} along with heat capacity upon doping and present the resulting magnetic phase diagram.