Important defeats on pinning of 2D pancake vortices in highly anisotropic Bi-2212 superconducting matrix with homovalent Bi/La substitution

Variation of flux pinning energy as a function of external magnetic fields up to 7 T for the pure and Bi-site La substituted Bi-2212 superconducting materials. Both the La inclusions inserted in the Bi-2212 crystal structure and the applied magnetic fields undermine the pinning of two-dimensional 2D pancake vortices as a consequence of the decoupling of the adjacent layers and the suppression of the interlayer Josephson coupling length.