期刊
PHYSICA B-CONDENSED MATTER
卷 481, 期 -, 页码 262-267出版社
ELSEVIER
DOI: 10.1016/j.physb.2015.11.022
关键词
Topological insulator; Mn-doped Bi2Se3; X-ray diffraction; X-ray photoemission spectroscopy; Ferromagnetism
资金
- Czech Science Foundation Grant [P204/14/30062S]
- Austrian Science Funds [F2504-N17 IRON]
- program of Czech Research Infrastructures [LM2011025]
- Ministry of Education [SAFMAT LM2011029, CENAM LO1409]
- Czech Academy of Sciences
A thorough investigation is presented of the magnetic and structural properties of Mn-doped Bi2Se3 topological insulators grown by molecular beam epitaxy on top of insulating BaF2 (111) substrates. The magnetic properties have been studied in the temperature range from 2 K to 300 K in magnetic fields up to 7 T. The systems were further characterized by means of high-resolution X-ray diffraction, electron-microprobe analysis, and X-ray photoemission spectroscopy. Samples with the atomic concentration of Mn up to about 0.06 exhibit an almost perfect crystalline structure while, for higher Mn concentrations, diffuse scattering from defects is observed. Photoemission results suggest a localized non-metallic Mn 3d(5) ground state which is weakly or intermediately coupled to the Bi2Se3 environment. The exchange interaction between the Mn moments leads to a ferromagnetic phase at low temperatures with a roughly linear relation between the Curie temperature and the atomic concentration of Mn. (C) 2015 Elsevier B.V. All rights reserved.
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