Universal relationship between crystallinity and irreversibility field of MgB2

Abstract

The relationship between irreversibility field, Hirr, and crystallinity of MgB2 bulks including carbon substituted samples was studied. The Hirr was found to increase with an increase of FWHM of MgB2 (110) peak, which corresponds to distortion of honeycomb boron sheet, and their universal correlation was discovered even including carbon substituted samples. Excellent Jc characteristics under high magnetic fields were observed in samples with large FWHM of (110) due to the enhanced intraband scattering and strengthened grain boundary flux pinning. The relationship between crystallinity and Hirr can explain the large variation of Hirr for MgB2 bulks, tapes, single crystals and thin films.

3 pages, 4 figures, to be published in Appl. Phys. Lett. (in press)

References in corpus (13)

• Strongly linked current flow in polycrystalline forms of the new superconductor MgB2
• Enhancement of the critical current density and flux pinning of MgB2 superconductor by nanoparticle SiC doping
• Enhancement of the upper critical field by nonmagnetic impurities in dirty two-gap superconductors
• Thin Film Magnesium Boride Superconductor with Very High Critical Current Density and Enhanced Irreversibility Field
• Very high upper critical fields in MgB2 produced by selective tuning of impurity scattering
• High-field superconductivity in alloyed MgB2 thin films
• Improved superconducting properties in nanocrystalline bulk MgB_2
• Effect of carbon nanotube doping on critical current density of MgB2 superconductor
• Effect of lattice strain and defects on the superconductivity of MgB2
• Properties of MgB2 thin films with carbon doping
• Effects of Boron Purity, Mg Stoichiometry and Carbon Substitution on Properties of Polycrystalline MgB${}_2$
• Enhancement of the irreversibility field by carbon substitution in single crystal MgB${}_2$
• Crystal growth and characterization of MgB2: Relation between structure and superconducting properties

Cited by in corpus (8)

• Permanent magnet with MgB2 bulk superconductor
• Nanoscale grains, high irreversibility field, and large critical current density as a function of high energy ball milling time in C-doped magnesium diboride
• Correlation between doping induced disorder and superconducting properties in carbohydrate doped MgB2
• Strongly connected ex-situ MgB2 polycrystalline bulks fabricated by solid-state self-sintering
• Towards the Realization of Higher Connectivity in MgB2 Conductors: In-situ or Sintered Ex-situ?
• Enhanced higher temperature (20-30 K) transport properties and irreversibility field in nano-Dy2O3 doped advanced internal Mg infiltration processed MgB2 composites
• Enhancement of Jc by Hf -Doping in the Superconductor MgB2: A Hyperfine Interaction Study
• Effect of nano-C doping on the in-situ processed MgB2 tapes