Development of ferromagnetism in the doped topological insulator<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Bi</mml:mtext></mml:…
By Y. Hor, P. Roushan, H. Beidenkopf, J. Seo, D. Qu, J. Checkelsky, L. Wray, Y. Xia, S.-Y. Xu, D. Qian and 4 more. Physical review B, 2010
337 citations recorded by the source corpus.
The development of ferromagnetism in Mn-doped Bi_2Te_3 is characterized through measurements on a series of single crystals with different Mn content. Scanning tunneling microscopy analysis shows that the Mn substitutes on the Bi sites, forming compounds of the type Bi_(2−x)Mn_xTe_3, and that the Mn substitutions are randomly distributed, not clustered. Mn doping first gives rise to local magnetic moments with Curie-like behavior, but by the compositions Bi_(1.96)Mn_(0.04)Te_3 and Bi_(1.91)Mn_(0.09)Te_3, a second-order ferromagnetic transition is observed, with T_C∼9–12 K. The easy axis of magnetization in the ferromagnetic phase is perpendicular to the Bi2Te3 basal plane. Thermoelectric power and Hall effect measurements show that the Mn-doped Bi_2Te_3 crystals are p-type. Angle-resolved photoemission spectroscopy measurements show that the topological surface states that are present in pristine Bi_2Te_3 are also present at 15 K in ferromagnetic Mn-doped Bi2−xMnxTe3 and that the dispersion relations of the surface states are changed in a subtle fashion.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/0efe21b46f577f7f3a4815cfea0206b24743cfd8
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Citations in the corpus
- Dilute ferromagnetic semiconductors: Physics and spintronic structures (2013, methodology): “Interestingly, the Bridgman method was successfully used to obtain rhombohedral Bi2−xMnxTe3, a ferromagnetic topological insulator, in which Mn ions that introduced both spins and holes, were found to be randomly distributed up to at least x = 0.09 (Hor et al., 2010).”
- High-temperature quantum anomalous Hall regime in a MnBi2Te4/Bi2Te3 superlattice (2020, background): “The well-known bandstructure of undoped Bi2Te3 [20] is not an obvious candidate for QAH, since the Dirac point, nestled in the bulk valence bands, would be largely unaffected by a random distribution of Mn in the dilute limit [21].”