Naslov
Flux pinning in nanoparticle doped MgB2/Cu tapes

Autori
Babić, Emil ; Kušević, Ivica ; Husnjak, Ozren ; Soltanian, Saeid ; Wang, Xiao Lin ; Dou, Shi Xue

Izvornik
Physica C - Superconductivity and its Applications (0921-4534) 460-462 (2007), Part 1; 589-590

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

Ključne riječi
MgB2; superconductor; irreversibility field; critical current density; nanostructured

Sažetak
The irreversibility fields Birr and critical current densities Jc of undoped and Si and SiC nanoparticle doped (5, 10 and 20 wt.%) MgB2 tapes were measured in the temperature (T) range 2-38 K and in magnetic fields B<16 T. Whereas Birr of undoped tapes varies smoothly with T, those of doped tapes show a change in slope around a crossover field Bcr which increases with nanoparticle content and also depends on their type. This indicates matching effect in vortex pinning, probably associated with Mg2Si nanoprecipitates formed during heat treatment. Indeed, Birr of doped tapes was enhanced in respect to that of undoped one with the highest enhancement for Birr=Bcr, but the enhancement remained high ~1.4 even for Birr>>Bcr (low temperatures). The variations of Jc and the pinning force density Fp=JcB with B and T support the above findings.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Proceedings of the 8th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors - M2S-HTSC VIII, Dresden, Germany, 9-14 July 2006, Edited by B. Büchner and J. Fink

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