Modeling of levitation force by using Jc distribution approaches for bulk MgB2 fabricated with different methods

Abstract

Studies in literature have shown that the bulk MgB2 structural characteristics and the associated superconducting properties are not homogeneous throughout the entire sample. This study focuses on understanding the effect of local differences in Jc distribution on the levitation force. For this purpose, numerical modeling was performed for four samples, two of which were previously fabricated, and the other two were fictionalized. Levitation forces for these samples were calculated with three different Jc distribution approaches: uniform, semi-uniform, and non-uniform. Comparing the four samples’ numerical results shows us that the position dependence of Jc should be considered when performing numerical modeling in cases where there are significant local differences because of the local defects, thermal origin stress cracks in the outer side, and impurity distribution. It is inferred that the obtained results will help to elucidate the physical background of the local features and shielding currents on the levitation force and improve the bulk properties of the MgB2 samples.