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Superconductivity in Ca-doped graphene laminates.

J Chapman¹, Y Su¹, C A Howard²

¹School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK.

Scientific Reports

|March 17, 2016

Summary

This summary is machine-generated.

Superconductivity in graphene was experimentally observed for the first time using calcium-doped graphene laminates. The superconducting properties are tunable by adjusting the calcium layer

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Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

Graphene exhibits exceptional electronic properties, yet superconductivity remains experimentally elusive.
Theoretical models predict superconductivity in graphene, but unambiguous observation is lacking.

Purpose of the Study:

To experimentally investigate superconductivity in metal-decorated graphene.
To explore the conditions necessary for achieving superconductivity in graphene.

Main Methods:

Fabrication of graphene laminates with well-separated graphene crystallites.
Doping graphene laminates with calcium (Ca) and other alkali metals (K, Cs, Li).
Measurement of superconducting transition temperatures (Tc) under varying confinement and doping levels.

Main Results:

Robust superconductivity observed in calcium-doped graphene laminates at temperatures between 4-6 K.
Superconducting transition temperature (Tc) is dependent on calcium layer confinement and charge carrier concentration.
Calcium is the only dopant among those tested that induces superconductivity above 1.8 K.

Conclusions:

Superconductivity in free-standing, metal-decorated monolayer graphene is achievable under optimized conditions.
Tunability of superconducting response through doping and metal layer confinement is demonstrated.
This work brings the experimental realization of superconductivity in graphene closer.