Akademik Veri Yönetim Sistemi
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, cilt.37, sa.3, ss.499-508, 2024 (SCI-Expanded)
Remanent magnetization of Y0.5Lu0.5Ba2Cu3Oy superconductor produced by a modified melt powder melt growth (MPMG)
technique at 25 K temperature has been investigated by both experimental and numerical computations using H-formulation
in the finite element method (FEM). At the low field and low-temperature conditions, remanent magnetization MREM is equal
to the difference between the field cooled magnetization MFC and zero field cooled magnetization MZFC. Experimental data
for remanent magnetization as a function of temperature can be reproduced quite well by numerical computations based
on H-formulation providing an estimation of how the critical current density varies with temperature. The critical current
density at 25 K was estimated to be a 6.50× 108
A/m2
, and the temperature dependence is determined as (1−T/Tc)
2.5 from
the best fit curve of MREM(T) for the sample studied. In numerical calculations, we have used Jc(H)=Jc0/(1+H/HREF), where
HREF is a constant characterizing the superconducting sample. Furthermore, both flux density profile and current density
profile have been obtained from the numerical calculations for various stages of the field applications or temperature values
during the heating process.