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

Abstract

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 MnSb_2nTe_3n+1family, 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 (SdH) oscillations provides evidence for Dirac fermions with π Berry phase. Our comprehensive investigation reveals that MnSb₁₂Te₁₉exhibits a FM ground state along with AHE, and hole-dominated transport properties consistent with ARPES measurements.