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Superconducting Calcium-Intercalated Bilayer Graphene.

Satoru Ichinokura1, Katsuaki Sugawara2, Akari Takayama1

  • 1Department of Physics, University of Tokyo , Tokyo 113-0033, Japan.

ACS Nano
|January 28, 2016
PubMed
Summary
This summary is machine-generated.

Superconductivity was directly observed in calcium-intercalated bilayer graphene (C6CaC6), the thinnest form of intercalated graphite. Pristine and lithium-intercalated graphene did not exhibit superconductivity, highlighting the role of intercalated atoms.

Keywords:
carbonelectrical transportgraphenegraphite-intercalation-compoundsemiconductor surfacesuperconductivityultrahigh vacuum

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene, a single layer of carbon atoms, exhibits unique electronic properties.
  • Intercalation, inserting atoms between graphene layers, can significantly modify these properties.
  • Superconductivity in layered materials is a key area of condensed matter research.

Purpose of the Study:

  • To investigate superconductivity in calcium-intercalated bilayer graphene (C6CaC6).
  • To compare the superconducting properties of C6CaC6 with pristine and lithium-intercalated bilayer graphene (C6LiC6).
  • To establish C6CaC6 as the thinnest limit of Ca-intercalated graphite exhibiting superconductivity.

Main Methods:

  • Fabrication of pristine, Li-intercalated, and Ca-intercalated bilayer graphene on SiC substrate.
  • In situ electrical transport measurements using a 4-point-probe method.
  • Measurements conducted in ultrahigh vacuum under zero and nonzero magnetic fields.

Main Results:

  • Direct evidence of superconductivity observed in C6CaC6 with a zero-resistance onset temperature (T(c)(onset)) of 4 K.
  • The T(c)(onset) of C6CaC6 decreased with increasing magnetic field, confirming its superconducting origin.
  • Pristine bilayer graphene and C6LiC6 showed no signs of superconductivity.

Conclusions:

  • Calcium intercalation drives superconductivity in bilayer graphene, establishing a new record for thin-film superconductivity.
  • The species of intercalated atoms are crucial for inducing superconductivity in graphene systems.
  • This work opens avenues for exploring novel superconducting phenomena in 2D materials.