Effects of grain-boundaries in superconducting materials
JJ Hogan-O'Neill, AM Martin, F Annett, PEA Turchi (ed.), A Gonis (ed.), L Colombo (ed.)
MRS Advances | MATERIALS RESEARCH SOCIETY | Published : 1998
We examine the effects of grain-boundaries on the order-parameter and critical-currents in superconductors. We use a geometrical model of the lattice structure of grain-boundaries. We solve the Bogoliubov-de Gennes equation using the Recursion Method to obtain the self-consistent BCS gap function Δ and the local density of states N(E) near the boundary. Imposing a phase difference across the boundary we calculate the supercurrent and hence obtain the critical-current, Ic, of the junction.