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We report c-axis transport studies on magnetic topological insulatorsMn(Bi1-xSbx)2Te4. We performed systematic c-axis magnetoresistivitymeasurements under high magnetic fields (up to 35 T) on several representativesamples. We find the lightly hole- and lightly electron-doped samples, whileboth having the same order of magnitude of carrier density and similarspin-flop transitions, exhibit sharp contrast in electronic anisotropy andtransport mechanism. The electronic anisotropy is remarkably enhanced for thelightly hole-doped sample relative to pristine MnBi2Te4 but not for the lightlyelectron-doped sample. The lightly electron-doped sample displays a giantnegative longitudinal magnetoresistivity (LMR) induced by the spin-valve effectat the spin-flop transition field, whereas the lightly hole-doped sampleexhibits remarkable negative LMR consistent with the chiral anomaly behavior ofa Weyl semimetal. Furthermore, we find the large negative LMR of the lightlyhole-doped sample extends to a wide temperature range above the N\'eeltemperature (T_N) where the magnetoconductivity is proportional to B^2. Thisfact, together with the short-range intralayer ferromagnetic correlationrevealed in isothermal magnetization measurements, suggests the possiblepresence of the Weyl state above T_N. These results demonstrate that in thec-axis magnetotransport of Mn(Bi1-xSbx)2Te4, the spin scattering is dominant inthe lightly electron-doped sample but overwhelmed by the chiral anomaly effectin the lightly hole-doped sample due to the presence of the Weyl state. Thesefindings extend the understanding of the transport properties ofMn(Bi1-xSbx)2Te4.

Giant spin-valve effect and chiral anomaly in antiferromagnetic topological insulators Mn(Bi1-xSbx)2Te4