Magnetotransport and angle-resolved photoemission spectroscopy of MnSb12Te19: a new member of MnSb2nTe3n+1 family

The quest for intrinsically ferromagnetic topological materials is a focal point in the study of topological phases of matter, as intrinsic ferromagnetism plays a vital role in realizing exotic properties such as the anomalous Hall effect (AHE) in quasi-two-dimensional materials, and this stands out as one of the most pressing concerns within the field. Here, we investigate a novel higher order member of the MnSb2nTe3n+1 family, MnSb12Te19, for the first time combining magnetotransport and angle-resolved photoemission spectroscopy (ARPES) measurements. Our magnetic susceptibility experiments identify ferromagnetic transitions at temperature T-c = 18.7 K, consistent with our heat capacity measurements (T = 18.8 K). The AHE is observed for the field along the c-axis below T-c. Our study of Shubinikov-de-Haas oscillations provides evidence for Dirac fermions with pi Berry phase. Our comprehensive investigation reveals that MnSb12Te19 exhibits a FM ground state along with AHE, and hole-dominated transport properties consistent with ARPES measurements.