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Related Experiment Videos

Superconductivity of bulk CaC6.

N Emery1, C Hérold, M d'Astuto

  • 1Laboratoire de Chimie du Solide Minéral-UMR 7555, Université Henri Poincaré Nancy I, B.P. 239, 54506 Vandoeuvre-lès-Nancy Cedex, France.

Physical Review Letters
|October 4, 2005
PubMed
Summary
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Researchers synthesized bulk calcium carbide (CaC6) using a new method. This metal-graphite compound exhibits superconductivity at 11.5 K and possesses unique rhombohedral crystal symmetry.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid-State Chemistry

Background:

  • Graphite intercalation compounds (GICs) are materials with unique electronic and structural properties.
  • Calcium carbide (CaC6) is a GIC with potential for novel physical phenomena.
  • Previous studies on MC6 compounds have not identified rhombohedral symmetry or bulk superconductivity.

Purpose of the Study:

  • To synthesize bulk samples of the graphite intercalation compound CaC6.
  • To determine the crystal structure of CaC6.
  • To investigate the superconducting properties of bulk CaC6.

Main Methods:

  • Novel synthesis of CaC6 from highly oriented pyrolytic graphite.
  • Complete crystal structure determination.

Related Experiment Videos

  • Magnetization measurements to detect superconductivity.

    • Main Results:

    • Successfully obtained bulk CaC6 samples.
    • Determined CaC6 crystal structure, revealing unique rhombohedral symmetry among MC6 compounds.
    • Observed superconductivity in bulk CaC6 at a critical temperature of 11.5 K.

    Conclusions:

    • The novel synthesis method provides access to bulk CaC6.
    • CaC6 is the only MC6 metal-graphite compound with rhombohedral symmetry.
    • Bulk CaC6 exhibits superconductivity at 11.5 K, expanding the understanding of superconducting GICs.