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Magnetotransport measurements of PtPb 4  single crystals with the  T c  of ∼2.80 K reveal pronounced exotic topological nature. An anomalous negative longitudinal magnetoresistance (MR) related to the chiral anomaly and a linear-like transverse MR examined within the framework of quantum MR theory were studied. Results indicate the presence of chiral-anomaly-induced quantum transport associated with the Weyl states and show a Dirac-cone-like band dispersion in PtPb 4 . This work reveals the drastic impact of the concept that the surface electrons in a Weyl fermion state may dominate the normal-state magnetotransport in PtPb 4 , leading to the conclusion that PtPb 4  can be a Weyl-semimetal superconductor candidate.

new journal of physics

Normal-state negative longitudinal magnetoresistance and Dirac-cone-like dispersion in PtPb<sub>4</sub> single crystals: a potential Weyl-semimetal superconductor candidate

Normal-state negative longitudinal magnetoresistance and Dirac-cone-like dispersion in PtPb4 single crystals: a potential Weyl-semimetal superconductor candidate

Normal-state negative longitudinal magnetoresistance and Dirac-cone-like dispersion in PtPb₄ single crystals: a potential Weyl-semimetal superconductor candidate