Abstract
We report on a diluted magnetic semiconductor based on the ${\mathrm{Sb}}_{2}{\mathrm{Te}}_{3}$ tetradymite structure doped with very low concentrations of vanadium (1--3 at. %). The anomalous transport behavior and robust magnetic hysteresis loops observed in magnetotransport and magnetic measurements are experimental manifestations of the ferromagnetic state in these materials. The $p\ensuremath{-}d$ exchange between holes and vanadium $3d$ spins is estimated from the behavior of the magnetoresistance. A Curie temperature of at least 22 K is observed for ${\mathrm{Sb}}_{1.97}{\mathrm{V}}_{0.03}{\mathrm{Te}}_{3}.$ This discovery offers possibilities for exploring magnetic properties of other tetradymite structure semiconductors doped with a wide range of $3d$ transition metals.
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