Revised phase diagram of the high-Tc cuprate superconductor Pb-doped Bi2Sr2CaCu2O8+delta revealed by anisotropic transport measurements

Although phase diagrams can be leveraged to investigate high transition temperature (high-Tc) superconductivity, the issue has not been discussed thoroughly. In this study, we elucidate the phase diagram of the overdoped side of high-Tc cuprates via systematic anisotropic transport measurements for Pb-doped Bi-2212 single crystals. We demonstrate that the characteristic temperatures of the "weak" pseudogap opening and electronic coherence cross each other at a critical doping level, while those of the "strong" pseudogap merges into that of superconducting fluctuations above the critical doping level. Our results indicate the importance of Mottness in high-Tc superconductivity.