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Related Experiment Videos

Superconductivity in dense MgB2 wires.

P C Canfield1, D K Finnemore, S L Bud'ko

  • 1Ames Laboratory, U.S. Department of Energy and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.

Physical Review Letters
|April 6, 2001
PubMed
Summary
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Researchers developed a method to create dense magnesium diboride (MgB2) wires. These wires exhibit excellent superconducting properties, comparable to or better than traditional MgB2 pellets.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Superconductivity

Background:

  • Magnesium diboride (MgB2) is a superconductor with a critical temperature (Tc) just below 40 K.
  • Previous methods for synthesizing MgB2 primarily yielded porous polycrystalline samples.

Purpose of the Study:

  • To develop a method for preparing dense MgB2 wires.
  • To characterize the superconducting properties of these dense MgB2 wires.

Main Methods:

  • Preparation of MgB2 wires by exposing boron filaments to magnesium (Mg) vapor.
  • Characterization of wire density, superconducting transition temperature (Tc), upper critical magnetic field (Hc2), critical current density (Jc), and normal-state resistivity.

Main Results:

Related Experiment Videos

  • Successfully fabricated dense MgB2 wires with a diameter of 160 micrometers, achieving over 80% density.
  • Wires exhibited full diamagnetism (chi = -1/4pi) in the superconducting state.
  • Normal-state resistivity at 40 K was 0.38 microOmega cm, indicating a long electronic mean-free path (l ~ 600 Å) and adherence to the clean limit.
  • Superconducting properties (Tc, Hc2(T), Jc) were comparable or superior to those of sintered MgB2 pellets.

    • Conclusions:

    • Dense MgB2 wires can be effectively prepared using Mg vapor deposition on boron filaments.
    • The fabricated MgB2 wires possess excellent superconducting characteristics, making them a promising material for applications.