AC losses and transverse resistivity in filamentary MgB2 tape with Ti barriers

We measured and analyzed AC losses of MgB2 tape with 19 filaments surrounded by Ti barriers and embedded in copper stabilization, exposed to external magnetic field with frequencies from 30 mHz up to 1.4 Hz and amplitudes up to 0.8 T at 4.2 K. Using the measured frequency dependence of the total AC losses we determined the contribution of hysteresis and coupling losses. The transverse resistivity determined from the coupling losses is considerably higher than that corresponding to the resistivity of copper stabilization before the tape processing due to diffusion of Ti. From the measured penetration field critical current densities were determined using results of theories for circular as well as rectangular filaments.

► AC losses in MgB2 tape with 19 filament upto 1.4 Hz and field amplitudes upto 0.8 T were determined. ► From the coupling losses the transverse resistivity of the matrix was determined ► The resistivity of the copper stabilization was found to be much higher than that of copper before the tape processing.