Flux pinning in nanoparticle doped MgB2/Cu tapes

Authors

E Babic, University of Zagreb, Croatia
I Kusevic, University of Zagreb, Croatia
O Husnjak, University of Zagreb, Croatia
Saeid Soltanian, University of WollongongFollow
Xiaolin Wang, University of WollongongFollow
S X. Dou, University of WollongongFollow

RIS ID

21841

Publication Details

Babic, E, Kusevic, I, Husnjak, O, Soltanian, S, Wang, X & Dou, SX (2007), Flux pinning in nanoparticle doped MgB2/Cu tapes, Physica C: Superconductivity and its Applications, 460-462(Part 1), pp. 589-590.

Abstract

The irreversibility fields B_irr and critical current densities J_c of undoped and Si and SiC nanoparticle doped (5, 10 and 20 wt%) MgB₂tapes were measured in the temperature (T) range 238 K and in magnetic fields B □ 16 T. Whereas B_irr of undoped tapes varies smoothly with T, those of doped tapes show a change in slope around a crossover field B_cr 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, B_irr of doped tapes was enhanced in respect to that of undoped one with the highest enhancement for B_irr ≈ B_cr, but the enhancement remained high ≈1.4 even for B_irr >> B_cr (low temperatures). The variations of J_c and the pinning force density F_p = J_cB with B and T support the above findings.

Grant Number

ARC/DP0770205

Additional Grant Number

http://purl.org/au-research/grants/ARC/DP0770205