Enhancement of Critical Current Density in low level Al-doped MgB2
arXiv:cond-mat/0405567 · doi:10.1088/0953-2048/17/10/001
Abstract
Two sets of MgB2 samples doped with up to 5 at. % of Al were prepared in different laboratories using different procedures. Decreases in the a and c lattice parameters were observed with Al doping confirming Al substitution onto the Mg site. The critical temperature (Tc) remained largely unchanged with Al doping. For 1 - 2.5 at.% doping, at 20K the in-field critical current densities (Jc's) were enhanced, particularly at lower fields. At 5K, in-field Jc was markedly improved, e.g. at 5T Jc was enhanced by a factor of 20 for a doping level of 1 at.% Al. The improved Jcs correlate with increased sample resistivity indicative of an increase in the upper critical field, Hc2, through alloying.
17 pages, 4 figures, to be published in Superconductor Science and Technology
References in corpus (8)
- Enhancement of the critical current density and flux pinning of MgB2 superconductor by nanoparticle SiC doping
- Very high upper critical fields in MgB2 produced by selective tuning of impurity scattering
- Carbon doping of superconducting magnesium diboride
- Effect of lattice strain and defects on the superconductivity of MgB2
- Critical Current Density and Resistivity of MgB2 Films
- High-pressure synthesis of pure and doped superconducting MgB2 compounds
- Influence of the starting composition on the structural and superconducting properties of MgB2 phase
- Josephson Junctions with Minimal Length
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- Enhancement of JC-B Properties in MoSi2 doped MgB2 tapes