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Related Experiment Videos

Superconductivity in MgB2: clean or dirty?

I I Mazin1, O K Andersen, O Jepsen

  • 1Center for Computational Materials Science, Naval Research Laboratory, Washington, DC 20375-5000, USA.

Physical Review Letters
|September 13, 2002
PubMed
Summary

The two-gap model for superconductivity in magnesium diboride (MgB2) may be incomplete. Accounting for band structure differences in normal transport explains the lack of correlation between critical temperature and resistivity.

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Area of Science:

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

Background:

  • The two-gap model is widely accepted for superconductivity in magnesium diboride (MgB2).
  • This model predicts a strong link between critical temperature (Tc) and interband impurity scattering, leading to a correlation with residual resistivity.
  • Experimental observations do not support this predicted correlation.

Purpose of the Study:

  • To resolve the discrepancy between the two-gap model predictions and experimental data for MgB2 superconductivity.
  • To propose an alternative explanation for the observed relationship between Tc and residual resistivity.

Main Methods:

  • Theoretical analysis of the electronic structure of MgB2.
  • Incorporation of band disparity effects into normal transport calculations.

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  • Re-evaluation of the two-gap model in light of these findings.

    • Main Results:

    • The observed lack of correlation between Tc and residual resistivity can be explained by considering band disparity.
    • Band disparity effects in normal transport are crucial, not just in the superconducting state.
    • This refined understanding challenges the direct link predicted by the standard two-gap model.

    Conclusions:

    • The standard two-gap model for MgB2 superconductivity requires modification to include normal state band disparity.
    • This approach reconciles theoretical predictions with experimental observations regarding Tc and resistivity.
    • A more comprehensive understanding of MgB2 superconductivity emerges from considering both normal and superconducting states' electronic structures.