(Ba,K)(Cd,Mn)2As2 shows colossal negative magnetoresistance reaching approximately -100% at 2 K that saturates near 0.35 T.
Dietl, A ten-year perspective on dilute magnetic semiconductors and oxides
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Colossal low-field negative magnetoresistance in CaAl$_{2}$Si$_{2}$-type diluted magnetic semiconductors (Ba,K)(Cd,Mn)$_{2}$As$_{2}$
(Ba,K)(Cd,Mn)2As2 shows colossal negative magnetoresistance reaching approximately -100% at 2 K that saturates near 0.35 T.