Influence of disorder on Hc2-anisotropy and flux pinning in MgB2
arXiv:cond-mat/0410573 · doi:10.1002/pssc.200460800
Abstract
The upper critical field and flux pinning in MgB2 single crystals were investigated. The implications of these properties for technical applications are discussed and compared with transport properties of polycrystalline bulk samples and wires. In these untextured materials current percolation is important, especially at high magnetic fields. It is shown that the anisotropy of the upper critical field influences the "irreversibility line" and that the application range of MgB2 is limited by the smallest upper critical field (i.e., for the field direction perpendicular to the boron planes). Disorder, introduced by irradiation with neutrons, enhances the upper critical field, reduces the anisotropy and drastically changes flux pinning. While the enhanced Hc2 and the reduced anisotropy generally improve the transport properties of the polycrystalline samples, the contribution of the radiation-induced defects to flux pinning is small compared to the as-grown defect structure (grain boundary pinning).
7 pages, 13 figures
Cited by in corpus (11)
- Effects of neutron irradiation on polycrystalline Mg11B2
- Enhanced flux pinning in neutron irradiated MgB2
- Superconducting and Normal State Properties of Neutron Irradiated MgB2
- Influence of the upper critical field anisotropy on the transport properties of polycrystalline MgB
- Superconductivity of magnesium diboride
- Persistence of Metastable Vortex Lattice Domains in MgB2 in the Presence of Vortex Motion
- High upper critical field (120 T) with small anisotropy of highly hydrogen-substituted SmFeAsO epitaxial film
- Non-equilibrium structural phase transitions of the vortex lattice in MgB2
- Preparation and properties of amorphous MgB/MgO superstructures: A new model disordered superconductor
- Abrikosov flux-lines in two-band superconductors with mixed dimensionality
- Enhancement of by Proton Irradiation in HgBaCaCuO Single Crystals