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Related Experiment Videos

Boron isotope effect in superconducting MgB2.

S L Bud'ko1, G Lapertot, C Petrovic

  • 1Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA.

Physical Review Letters
|April 6, 2001
PubMed
Summary

We synthesized magnesium diboride (MgB2), a superconductor with a high transition temperature of 40.2 K. The boron isotope effect confirms MgB2 is a conventional phonon-mediated superconductor.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Superconductivity

Background:

  • Magnesium diboride (MgB2) is a binary intermetallic compound.
  • MgB2 exhibits a remarkably high superconducting transition temperature (Tc).

Purpose of the Study:

  • To investigate the preparation method of MgB2.
  • To study the boron isotope effect in MgB2.
  • To determine the underlying mechanism of superconductivity in MgB2.

Main Methods:

  • Preparation of MgB2 with different boron isotopes (Mg11B2 and Mg10B2).
  • Temperature-dependent magnetization measurements.
  • Specific heat measurements.

Main Results:

  • A superconducting transition temperature Tc of 40.2 K was observed for Mg11B2.

Related Experiment Videos

  • A 1.0 K shift in Tc was measured between Mg11B2 and Mg10B2.
  • The observed boron isotope effect is consistent with phonon-mediated superconductivity.

    • Conclusions:

    • MgB2 is a phonon-mediated BCS superconductor.
    • The high Tc in MgB2 is attributed to electron-phonon coupling.
    • The study provides insights into the mechanism of superconductivity in MgB2.