Structure of superconducting Ca-intercalated bilayer Graphene/SiC studied using total-reflection high-energy positron diffraction

Y. Endo, Y. Fukaya, I. Mochizuki, A. Takayama, T. Hyodo, S. Hasegawa

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We have investigated the atomic structure of superconducting Ca-intercalated bilayer graphene on a SiC(0001) substrate using total-reflection high-energy positron diffraction. By comparing the experimental rocking-curves with ones calculated for various structural models using a full-dynamical theory, we have found that Ca atoms are intercalated in the graphene-buffer interlayer, rather than between the two graphene layers. From transport measurements, the superconducting transition was observed to be at Tc onset = 4 K for this structure. This study is the first to clearly identify the relation between the atomic arrangement and superconductivity in Ca-intercalated bilayer graphene.

Original languageEnglish
Pages (from-to)857-862
Number of pages6
JournalCarbon
Volume157
DOIs
Publication statusPublished - 2020 Feb

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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