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We report large magnetoresistance (MR) and Shubnikov-de Haas (SdH)oscillations in single crystals of magnetically (M= Ni and Fe) dopedM$_x$Bi$_{0.97-x}$Sb$_{0.03}$ ($x=$ 0, 0.02) topological insulators. TheR$\bar{3}$m symmetry and phase have been confirmed by the Rietveld refinementof x-ray diffraction data. Interestingly, a magnetic field induced phasetransition from semi-metallic to semi-conducting type is found with the energygap around 80 meV at 15 Tesla in the $x=$ 0 sample. Moreover, we observe linearbehavior of MR up to 15 Tesla in transverse mode and SdH oscillations inlongitudinal mode where the field direction is with respect to the current andcrystal plane. For the parent sample, we found the coherence length L$_\phi=$12.7 nm through the fitting of MR data in transverse mode with modified H-L-Nequation. The extracted frequencies of SdH oscillations using the fast Fouriertransform method and Landau level (LL) fan diagram are found to be consistentfor the parent and Ni doped samples. The determined Fermi surface area is foundto be slightly larger in Ni doped as compared to the parent sample possibly dueto change in the Fermi energy. The Kohler's plot indicates a single scatteringmechanism below 100 K. More importantly, the analysis with the help of LL fandiagram reveals the non-zero Berry phase $\phi_{\rm B}= -$(1$\pm$0.1)$\pi$,which demonstrates the non-trivial topological states near the Dirac point inthe parent and Ni doped samples.

Magneto-transport and Berry phase in magnetically doped Bi$_{0.97-x}$Sb$_{0.03}$ single crystals