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Intercalant-driven superconductivity in YbC6 and CaC6.

I I Mazin1

  • 1Center for Computational Materials Science, Naval Research Laboratory, Washington, DC 20375, USA.

Physical Review Letters
|December 31, 2005
PubMed
Summary

Superconductivity in YbC6 and CaC6 is driven by intercalant phonons, unlike other intercalated graphites. Differences in critical temperatures are explained by the isotope effect from Yb and Ca atomic masses.

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Area of Science:

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

Background:

  • Superconductivity observed in Ytterbium hexacarbon (YbC6) and Calcium hexacarbon (CaC6) at higher temperatures than previously known intercalated graphites.
  • Existing understanding of superconductivity in intercalated graphites does not fully explain these new observations.

Purpose of the Study:

  • Investigate the mechanism of superconductivity in YbC6 and CaC6.
  • Identify the relevant phonons responsible for superconductivity.
  • Explain the significant difference in critical temperatures (Tc) between YbC6 and CaC6.

Main Methods:

  • First-principles calculations.
  • Phonon spectrum analysis.
  • Superconducting mechanism investigation.

Main Results:

  • Coupling with intercalant phonons is identified as the primary mechanism for superconductivity in YbC6 and CaC6.
  • This mechanism differs from that in alkaline-intercalated graphite compounds.
  • The isotope effect, stemming from the mass difference between Ytterbium (Yb) and Calcium (Ca), explains the varying critical temperatures.

Conclusions:

  • Intercalant phonon coupling is crucial for superconductivity in YbC6 and CaC6.
  • The observed differences in critical temperatures are attributed to the distinct atomic masses of Ytterbium and Calcium.
  • This study provides new insights into the mechanisms governing superconductivity in novel carbon-based materials.

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