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Superconductivity in heavy alkaline-Earth intercalated graphites.

J S Kim1, L Boeri, J R O'Brien

  • 1Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.

Physical Review Letters
|August 7, 2007
PubMed
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Superconductivity was discovered in strontium-intercalated graphite (SrC6) at 1.65 K. This finding, along with reduced anisotropy and an anisotropic gap, offers new insights into superconducting materials.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Superconductivity

Background:

  • Alkaline earth metal-intercalated graphite compounds (AeC6) are known superconductors.
  • Calcium-intercalated graphite (CaC6) exhibits superconductivity with anisotropic properties.

Purpose of the Study:

  • To investigate the superconducting properties of strontium-intercalated graphite (SrC6).
  • To compare the superconductivity of SrC6 with CaC6 and understand the factors influencing critical temperature (Tc).

Main Methods:

  • Magnetic susceptibility measurements.
  • Specific heat (Cp) measurements.
  • Analysis of upper critical fields and superconducting gap anisotropy.

Main Results:

Related Experiment Videos

  • Superconductivity was observed in SrC6 below 1.65(6) K.
  • SrC6 showed significantly reduced anisotropy in upper critical fields compared to CaC6.
  • The specific heat anomaly at Tc was smaller than BCS predictions, indicating an anisotropic superconducting gap.

Conclusions:

  • The lower Tc in SrC6, compared to CaC6, is attributed to "negative" pressure effects reducing electron-phonon coupling.
  • SrC6 exhibits an anisotropic superconducting gap, similar to CaC6.
  • No superconductivity was observed in BaC6 down to 0.3 K.