Unscaling Superconducting Parameters with T-c for Bi-2212 and Bi-2223: A Magnetotransport Study in the Superconductive Fluctuation Regime

摘要

To investigate the origin of the enhanced T-c (approximate to 110K) of the trilayer cuprate superconductor Bi2Sr2Ca2Cu3O10+delta (Bi-2223), we have performed systematic magnetoresistance (MR) measurements on this superconductor, as well as on the bilayer superconductor, Bi2Sr2CaCu2O8+delta (Bi-2212). The in-plane coherence length, xi(ab), and the specific-heat jump, Delta C, have been estimated using the theory of renormalized superconductive fluctuations, and the doping dependence of these parameters has been qualitatively explained using the Fermi arc approach. A detailed comparison of the superconducting parameters with T-c for these compounds suggests that an additional superconducting condensation energy exists, due to an increase in the number of stacking CuO2 planes in a unit cell.