Flux pinning and inhomogeneity in MgB2/Fe wires

Authors

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

RIS ID

22465

Publication Details

Husnjak, O, Babic, E, Kusevic, I, Wang, X, Soltanian, S & Dou, SX (2007), Flux pinning and inhomogeneity in MgB2/Fe wires, Solid State Communications, 143(8-9), pp. 412-415.

Abstract

Transport critical current densities J_c and irreversibility fields of undoped and nanoparticle doped (10 wt% SiC) Fe-sheathed MgB₂wires were measured from 2 to 40 K in magnetic field. For the best segments of wires (≤1 cm) both the magnitude and field variations of J_c and the pinning force density F_p=J_cB depend only on the magnitude of B_iir, hence the strength of flux-pinning. B_iir of doped wire for T≤30K is ~1.4 times larger than that of undoped and reaches that of NbTi (10 T at 4.2 K) already at 20 K. Accordingly, its high-field J_cs and F_ps are large, typically three times larger than the best literature results, and are limited by the porosity and inhomogeneity of the superconducting cores in present-day MgB₂ wires.

Grant Number

ARC/DP0770205

Additional Grant Number

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