Naslov
Influence of magnetic nanoparticles on superconductivity of MgB2

Autori
Novosel, Nikolina ; Babić, Emil

Izvornik
Physica. C, Superconductivity (0921-4534) 493 (2013); 119-124

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
MgB2 wires; superconductivity; magnetic nanoparticles; flux pinning

Sažetak
Recently we begun systematic study of the influence of magnetic nanoparticles (MNPs) on the superconducting properties (transition temperature Tc, critical fields and critical current density, Jc) of MgB2 wires. We prepared over 60 Fe-sheathed MgB2 wires doped with different types and quantities of MNPs, such as pure metals (Fe, Co, Ni), magnetic borides (Fe2B, Co2B, NiCoB) and ferrites (AFe2O4, A = Mn, Fe, Co, Ni, Cu). Both, uncoated and coated (with silica or dextrin) MNPs were used in order to assess also the effects of co-doping and of interactions between MNPs. All MNPs suppress Tc of MgB2 and higher MNP contents inevitably cause deterioration of superconducting properties of wires. However, light doping (<2.5 wt.%) with few species of MNP (Ni, NiCoB and dextrin coated NiFe2O4 and Fe3O4) improved low-temperature, high-field Jc of MgB2 wires. Possible origin of this improvement is briefly discussed.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
New3SC-9.

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