Mn-Rich MnSb₂ Te₄ : A Topological Insulator with Magnetic Gap Closing at High Curie Temperatures of 45-50 K.

ABSTRACT: Ferromagnetic topological insulators exhibit the quantum anomalous Hall effect, which is potentially useful for high-precision metrology, edge channel spintronics, and topological qubits.  The stable 2+ state of Mn enables intrinsic magnetic topological insulators. MnBi₂ Te₄ is, however, antiferromagnetic with 25 K Néel temperature and is strongly n-doped. In this work, p-type MnSb₂ Te₄ , previously considered topologically trivial, is shown to be a ferromagnetic topological insulator for a few percent Mn excess. i) Ferromagnetic hysteresis with record Curie temperature of 45-50 K, ii) out-of-plane magnetic anisotropy, iii) a 2D Dirac cone with the Dirac point close to the Fermi level, iv) out-of-plane spin polarization as revealed by photoelectr

SUBMITTER: Wimmer S 

PROVIDER: S-EPMC11468489 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature