Magnetic properties of the layered magnetic topological insulator Eu Sn2As2
Abstract
Eu Sn2As2 with a layered rhombohedral crystal structure is proposed to be a candidate for an intrinsic antiferromagnetic (AFM) topological insulator. Here, we have investigated systematic magnetoresistance (MR) and magnetization measurements on the high-quality Eu Sn2As2 single crystal with the magnetic field both parallel and perpendicular to the (00l) plane. Both the kink of magnetic susceptibility and longitudinal resistivity reveal that Eu Sn2An2 undergoes an AFM transition at TN=21 K . At T =2 K , the magnetization exhibits two successive plateaus of ∼5.6 and ∼6.6 μB/Eu at the corresponding critical magnetic fields. Combined with the negative longitudinal MR and abnormal Hall resistance, we demonstrate that Eu Sn2An2 undergoes complicated magnetic transitions from an AFM state to a canted ferromagnetic (FM) state at Hc and then to a polarized FM state at Hs as the magnetic field increases.
- Publication:
-
Physical Review B
- Pub Date:
- August 2021
- DOI:
- arXiv:
- arXiv:2109.03414
- Bibcode:
- 2021PhRvB.104e4435L
- Keywords:
-
- Condensed Matter - Materials Science
- E-Print:
- 12 pages, 4 figures