期刊
ADVANCED MATERIALS
卷 27, 期 33, 页码 4823-4829出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201501254
关键词
topological insulators; dilute magnetic semiconductors; magnetic doping; X-ray magnetic circular dichroism (XMCD); ferromagnetism
类别
资金
- National Key Projects for Basic Research of China [2014CB921103, 2013CB922103]
- National Natural Science Foundation of China [61176088, 11274003, 91421109, 61229401, 11474246, 11204265]
- New Century Excellent Talents Program in University [NCET-11-0240]
- PAPD project
- Qing Lan project
- Natural Science Foundation of Jiangsu Province [BK20130054, BK2013118]
- Program A Scheme for Outstanding Ph.D. Candidates of Nanjing University
- Fundamental Research Funds for the Central Universities
High-mobility (SmxBi1-x)(2)Se-3 topological insulators (with x = 0.05) show a Curie temperature of about 52 K, and the carrier concentration and Fermi wave vector can be manipulated by intentional Te introduction with no significant influence on the Curie temperature. The origin of the ferromagnetism is attributed to the trivalent Sm dopant, as confirmed by X-ray magnetic circular dichroism and first-principles calculations. The carrier concentration is on the order of 10 19 cm(-3) and the mobility can reach about 7200 cm(2) V-1 s(-1) with pronounced Shubnikov-de Haas oscillations.
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