Studies on Heterostructure of Bi-2212 and MgB2 Superconductors

Abstract

Systematic studies on the heterostructure of Bi-2212 and MgB₂ superconductors are reported. Bulk multilayer superconductors are prepared as Bi-2212-MgB₂-Bi-2212 with varying thicknesses of the MgB₂ layer. X-ray diffraction and DC magnetization characterization investigations confirmed the existence of both superconducting phases in heterostructured samples. The morphology of the samples at the surface and in cross section shows that the well crystallised grains of superconducting phases. The critical current density has increased in multilayers of Bi-2212 and MgB₂ superconductors owing to an increase in the superconducting volume fraction. In a tri-layer sample, inverted anisotropy in J_c is observed owing to the improvement of ab-plane properties because of the multilayer growth process. The instability of J_c at high field is observed due to various pinning mechanisms and microstructural changes in the samples.

URN:NBN:sciencein.jist.2023.v11.437