C-axis twist bicrystal, artificial and natural cross-whisker Bi2212 Josephson junctions

摘要

We present the latest data of the c-axis bicrystal twist Josephson junctions experiments of Li et al. and of the artificial and recent natural cross-whisker junction experiments on Bi2Sr2CaCU2O8+δ (Bi2212)of Takano et al. and Latyshev et al., respectively. These combined experiments provide strong evidence for a dominant s-wave order parameter and for strongly incoherent c-axis quasiparticle tunneling in Bi2212 for T ≤ T-c.