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Related Experiment Videos

Three-dimensional MgB2-type superconductivity in hole-doped diamond.

Lilia Boeri1, Jens Kortus, O K Andersen

  • 1INFM SMC and Dipartimento di Fisica, Università la Sapienza, Piazzale Aldo Moro 2, 00185 Rome, Italy.

Physical Review Letters
|December 17, 2004
PubMed
Summary

Superconductivity in boron-doped diamond arises from electron-phonon coupling, similar to MgB2. Three-dimensional effects limit its critical temperature (Tc) compared to MgB2.

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Area of Science:

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

Background:

  • Superconductivity observed in 3% boron-doped diamond below 4 K.
  • Comparison with superconductivity mechanisms in Magnesium Diboride (MgB2).

Purpose of the Study:

  • To investigate the mechanism behind superconductivity in boron-doped diamond.
  • To analyze the role of electron-phonon coupling and dimensionality on critical temperature (Tc).

Main Methods:

  • Numerical and analytical calculations.
  • Analysis of electron-phonon coupling in a three-dimensional system.
  • Comparison with two-dimensional models.

Main Results:

  • Superconductivity is attributed to electron-phonon coupling involving holes and optical bond-stretching modes.

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  • Three-dimensionality reduces crucial mode softening, limiting Tc compared to MgB2.
  • Even with higher doping (10%), diamond's Tc is predicted to be 25 K, lower than MgB2's 40 K.

    • Conclusions:

    • The electron-phonon coupling mechanism in doped diamond is analogous to MgB2.
    • Dimensionality plays a significant role in limiting the critical temperature of superconductivity in diamond.
    • Hole doping in Si and Ge requires higher concentrations for superconductivity above 1 K.