Abstract
We describe structural, magnetic, and transport properties of the Cd${}_{1\ensuremath{-}}$${}_{x}$${}_{\ensuremath{-}y}$Mn${}_{x}$Cr${}_{y}$Te ferromagnetic semiconductor alloy. Bulk Cd${}_{1\ensuremath{-}x\ensuremath{-}y}$Mn${}_{x}$Cr${}_{y}$Te crystals containing up to 10$%$ of Cr ($y$ $=$ 0.10) were grown by the Bridgman method and were found to be strongly $p$ type and ferromagnetic, with the highest Curie temperature of 362 K observed for $y$ $=$ 0.10. Magnetotransport measurements reveal the presence of the anomalous Hall effect up to and above room temperature, providing evidence that the observed ferromagnetism is characteristic of bulk Cd${}_{1\ensuremath{-}x\ensuremath{-}y}$Mn${}_{x}$Cr${}_{y}$Te. Our experiment data suggest that Cr ions play a crucial role in establishing ferromagnetism in this quaternary alloy.
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