MONODISPERSE CARBON SPHERES AS PINNING CENTERS FOR ENHANCED PROPERTIES OF MgB2 SUPERCONDUCTOR CABLES

R. F. LUCCAS; ET AL.

Mumbai

Conferencia; 18th International Conference on Vortices in Superconductors; 2021

IIT Kanpur and TIFR Mumbai

It has been observed in superconductivity, that C impurities improve properties of MgB2 samples at working conditions (H > 1 T). The substitution of B with C distorts crystal structure and generates local fluctuations of the superconductor order parameter. On the other side, it has also been observed that nanoparticles generate 3D vortex pinning centres, independents of the direction of the applied magnetic field.In this work, we study properties of MgB2 samples with monodisperse C spheres impurities acting as pinning centres. Structural properties as well as superconducting properties are measured. Results are compared with samples of MgB2 in concordance with superconductor cables of this material. Even no Mg substitution are expected in the MgB2 lattice, results are in the order of those obtained using addition of SiC as controlled spherical impurities.