期刊
APL MATERIALS
卷 4, 期 12, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4971354
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资金
- John Fell Oxford University Press Research Fund
- Engineering and Physical Sciences Research Council (EPSRC)
- EPSRC [EP/K03278X/1]
- EPSRC [EP/K03278X/1, EP/K013564/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K013564/1, EP/K03278X/1] Funding Source: researchfish
We present a nanoscale structural and density functional study of the Mn doped 3D topological insulator Bi2Te3. X-ray absorption near edge structure shows that Mn has valency of nominally 2+. Extended x-ray absorption fine structure spectroscopy in combination with electron energy loss spectroscopy (EELS) shows that Mn is a substitutional dopant of Bi and Te and also resides in the van der Waals gap between the quintuple layers of Bi2Te3. Combination of aberration-corrected scanning transmission electron microscopy and EELS shows that Mn substitution of Te occurs in film regions with increased Mn concentration. First-principles calculations show that the Mn dopants favor octahedral sites and are ferromagnetically coupled. (C) 2016 Author(s).
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