期刊
ACS NANO
卷 10, 期 2, 页码 2761-2765出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b07848
关键词
graphene; superconductivity; electrical transport; carbon; semiconductor surface; graphite-intercalation-compound; ultrahigh vacuum
类别
资金
- JSPS [KAKENHI 15H02105, 25246025, 22246006]
- MEXT [25107003, 25110010]
- Program for Key Interdisciplinary Research
- JSPS
- Grants-in-Aid for Scientific Research [15H02105, 15J11055, 15K17464, 25246025, 25107003, 25110010] Funding Source: KAKEN
We report the direct evidence for superconductivity in Ca-intercalated bilayer graphene C6CaC6, which is regarded as the thinnest limit of Ca-intercalated graphite. We performed the electrical transport measurements with the in situ 4-point probe method in ultrahigh vacuum under zero- or nonzero-magnetic field for pristine bilayer graphene, Li-intercalated bilayer graphene (C6LiC6) and C6CaC6 fabricated on SiC substrate. We observed that the zero-resistance state occurs in C6CaC6 with the onset temperature (T-c(onset)) of 4 K, while the T-c(onset) is gradually decreased upon applying the magnetic field. This directly proves the superconductivity origin of the zero resistance in C6CaC6. On the other hand, both pristine bilayer graphene and C6LiC6 exhibit nonsuperconducting behavior, suggesting the importance of intercalated atoms and its species to drive the superconductivity.
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