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Colossal magnetoresistance (MR) is a well-known phenomenon, notably observedin hole-doped ferromagnetic manganites. It remains a major research topic dueto its potential in technological applications. Though topological semimetalsalso show large MR, its origin and nature are completely different. Here, weshow that in the highly electron doped region, the Dirac semimetal CeSbTedemonstrates similar properties as the manganites. CeSb$_{0.11}$Te$_{1.90}$hosts multiple charge density wave (CDW) modulation-vectors and has a complexmagnetic phase diagram. We confirm that this compound is an antiferromagneticDirac semimetal. Despite having a metallic Fermi surface, the electronictransport properties are semiconductor-like and deviate from known theoreticalmodels. An external magnetic field induces a semiconductor-metal-liketransition, which results in a colossal negative MR. Moreover, signatures ofthe coupling between the CDW and a spin modulation are observed in resistivity.This spin modulation also produces a giant anomalous Hall response.

Colossal negative magnetoresistance in the complex charge density wave regime of an antiferromagnetic Dirac semimetal