Interlayer transport of quasiparticles and Cooper pairs in Bi2Sr2CaCu2O8+delta superconductors

We study the c-axis transport of stacked, intrinsic junctions in Bi2Sr2CaCu 2O8+delta single crystals, fabricated by the double-sided ion beam processi ng technique from single crystal whiskers. Measurements of the I-V characte ristics of these samples allow us to obtain the temperature and voltage dep endence of the quasiparticle c-axis conductivity in the superconducting sta te, the Josephson critical current, and the superconducting gap. We show th at the BCS d-wave model in the clean limit for resonant impurity scattering , with a significant contribution from coherent interlayer tunneling, descr ibes satisfactorily the low temperature and low energy c-axis transport of both quasiparticles and Cooper pairs.