期刊
ADVANCED MATERIALS
卷 32, 期 38, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202002825
关键词
2D materials; Kondo effect; magnetic doping; superconductivity; uniform composition
类别
资金
- National Science Foundation of China [51325205, 51290273, 51521091, 11574095, 91745115, 11774005, 51802314, 51861135201]
- Chinese Academy of Sciences [XDB30000000, ZDBS-LY-JSC027]
- Ministry of Science and Technology of China [2016YFA0200101, 2016YFA0300601]
- LiaoNing Revitalization Talents Program [XLYC1808013]
- SYNL-T.S. K Research Fellowship
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2018223]
- Program for Guangdong Introducing Innovative and Enterpreneurial Teams [2017ZT07C341]
- Economic, Trade and Information Commission of Shenzhen Municipality [201901171523]
- Development and Reform Commission of Shenzhen Municipality
Substitutional doping provides an effective strategy to tailor the properties of 2D materials, but it remains an open challenge to achieve tunable uniform doping, especially at high doping level. Here, uniform lattice substitution of a 2D Mo2C superconductor by magnetic Cr atoms with controlled concentration up to approximate to 46.9 at% by chemical vapor deposition and a specifically designed Cu/Cr/Mo trilayer growth substrate is reported. The concentration of Cr atoms can be easily tuned by simply changing the thickness of the Cr layer, and the samples retain the original structure of 2D Mo2C even at a very high Cr concentration. The controlled uniform Cr doping enables the tuning of the competition of the 2D superconductor and the Kondo effect across the whole sample. Transport measurements show that with increasing Cr concentration, the superconductivity of the 2D Cr-doped Mo2C crystals disappears along with the emergence of the Kondo effect, and the Kondo temperature increases monotonously. Using scanning tunneling microscopy/spectroscopy, the mechanism of the doping level effect on the interplay and evolution between superconductivity and the Kondo effect is revealed. This work paves a new way for the synthesis of 2D materials with widely tunable doping levels, and provides new understandings on the interplay between superconductivity and magnetism in the 2D limit.
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