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Doping of the band insulator FeS$_2$ with Co on the Fe site introduces asmall density of itinerant carriers and magnetic moments. The lattice constant,AC and DC magnetic susceptibility, magnetization, and specific heat have beenmeasured over the $0\le x\le 0.085$ range of Co concentration. The variation ofthe AC susceptibility with hydrostatic pressure has also been measured in asmall number of our samples. All of these quantities show systematic variationwith $x$ including a paramagnetic to disordered ferromagnetic transition at$x=0.007\pm 0.002$. A detailed analysis of the changes with temperature andmagnetic field reveal small power law dependencies at low temperatures forsamples near the critical concentration for magnetism, and just above the Curietemperature at higher $x$. In addition, the magnetic susceptibility andspecific heat are non-analytic around H=0 displaying an extraordinarily sharpfield dependence in this same temperature range. We interpret this behavior asdue to the formation of Griffiths phases that result from the quenched disorderinherent in a doped semiconductor.

Magnetic and thermodynamic properties of cobalt doped iron pyrite: Griffiths Phase in a magnetic semiconductor