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

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Although phase diagrams can be leveraged to investigate high transition temperature (high-${T}_{c}$) superconductivity, the issue has not been discussed thoroughly. In this study, we elucidate the phase diagram of the overdoped side of high-${T}_{c}$ 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-${T}_{c}$ superconductivity.