Superconducting Calcium-Intercalated Bilayer Graphene

Satoru Ichinokura, Katsuaki Sugawara, Akari Takayama, Takashi Takahashi, Shuji Hasegawa

Research output: Contribution to journalArticlepeer-review

189 Citations (Scopus)


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 (Tconset) of 4 K, while the Tconset 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.

Original languageEnglish
Pages (from-to)2761-2765
Number of pages5
JournalACS Nano
Issue number2
Publication statusPublished - 2016 Feb 23


  • carbon
  • electrical transport
  • graphene
  • graphite-intercalation-compound
  • semiconductor surface
  • superconductivity
  • ultrahigh vacuum


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