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 $T_c$ ($\approx$ 110 K) of thetrilayer cuprate superconductor Bi$_{2}$Sr$_{2}$Ca$_{2}$Cu$_{3}$O$_{10+\delta}$(Bi-2223), we have performed systematic magnetoresistance (MR) measurements onthis superconductor, as well as on the bilayer superconductor,Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ (Bi-2212). The in-plane coherencelength, $\xi_{ab}$, and the specific-heat jump, ${\Delta}C$, have beenestimated using the theory of renormalized superconductive fluctuations, andthe doping dependence of these parameters has been qualitatively explainedusing the Fermi arc approach. A detailed comparison of the superconductingparameters with $T_c$ for these compounds suggests that an additionalsuperconducting condensation energy exists, due to an increase in the number ofstacking CuO$_{2}$ planes in a unit cell.