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Related Experiment Videos

Percolative Superconductivity in Mg1-xB2.

P A Sharma1, N Hur, Y Horibe

  • 1Department of Physics & Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.

Physical Review Letters
|October 26, 2002
PubMed
Summary
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Magnesium deficiency in magnesium diboride (MgB2) causes phase separation into superconducting and insulating regions. This Mg-vacancy rich phase exhibits Anderson localization, with defects forming ordered patterns.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Magnesium diboride (MgB2) is a superconductor with potential applications.
  • Understanding the effects of defects, such as magnesium vacancies, is crucial for optimizing material properties.

Purpose of the Study:

  • To investigate the impact of magnesium deficiency on the electronic and structural properties of MgB2.
  • To characterize the phase separation phenomenon induced by Mg vacancies.

Main Methods:

  • Transport experiments were conducted on Mg1-xB2 samples.
  • Electron diffraction measurements were used to analyze defect structures.

Main Results:

  • A surprising phase separation occurs in Mg-deficient MgB2, creating Mg-vacancy rich and Mg-vacancy poor regions.

Related Experiment Videos

  • The Mg-vacancy poor phase remains superconducting.
  • The Mg-vacancy rich phase becomes insulating, likely due to Anderson localization of carriers.
  • Electron diffraction reveals ordered patterns of defects within the vacancy-rich regions.

    • Conclusions:

    • Mg deficiency in MgB2 leads to electronic phase separation.
    • The observed phenomenon shares similarities with, yet differs from, phase separation in La(2)CuO(4+delta).
    • The findings provide insights into defect-induced properties in superconductors.