The cause of ‘weak-link’ grain boundary behaviour in polycrystalline Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8</sub>and Bi<sub>2</sub>Sr<sub>2</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>10</sub>superconductors
Superconductor science and technology/Superconductor science & technology