Colossal low-field negative magnetoresistance in CaAl${}_2$Si${}_2$-type diluted magnetic semiconductors (Ba,K)(Cd,Mn)${}_2$As${}_2$

Bijuan Chen, Zheng Deng, Changqing Jin

We report the magnetic and magnetotransport properties of the layered CaAl${}_2$Si${}_2$-type diluted magnetic semiconductor (Ba${}_{1-x}$K${}_x$)(Cd${}_{1-y}$Mn${}_y$)${}_2$As${}_2$ over a broad…