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A series of MgB2 superconducting composite strands co-doped with Dy2O3 and Cwere prepared via an advanced internal Mg infiltration (AIMI) route.Thetransport properties and MgB2 layer growth were studied in terms of the Dy2O3doping level, reaction temperature, and reaction time. Transport studies showedthat both critical current densities, Jcs, and irreversibility fields, Birrs,were increased with Dy2O3 doping. The highest layer Jc was 1.35 x 10^5 A/cm2 at4.2 K, 10 T, 30% higher than that of the best AIMI wires without Dy2O3 doping.The highest "non-barrier" Jc reached 3.6 x 10^4 A/cm2 at 4.2 K, 10 T, which wasamong the best results reported so far. The improvements were even morepronounced at higher temperatures where the field at which the layer Jc reached10^4 A/cm2 was pushed out by 0.9 T at 20 K, 1.2 T at 25 K, and 1.4 T at 30 K.While little or no enhancement in Birr was seen at 10 K and 15 K, the increasesin Jc at higher temperatures were consistent with observed increases in Birr of17% at 20 K, 44% at 25 K, and 400% at 30 K. Also, there were some indicationsthat the reaction and layer growth of MgB2 was enhanced by Dy2O3 doping.

applied physics letters

Enhanced higher temperature (20-30 K) transport properties and  irreversibility field in nano-Dy2O3 doped advanced internal Mg infiltration  processed MgB2 composites