Revised phase diagram of the high-$T_c$ cuprate superconductor Pb-doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ revealed by anisotropic transport measurements

TL;DR

This study maps the phase diagram of Pb-doped Bi-2212 cuprates using anisotropic transport measurements, revealing critical interactions between pseudogap states and superconductivity that highlight Mottness's role.

Contribution

It provides a detailed phase diagram of overdoped high-$T_c$ cuprates, showing how pseudogap and coherence temperatures interact, emphasizing the importance of Mottness in superconductivity.

Findings

Weak pseudogap and electronic coherence temperatures cross at a critical doping.

Strong pseudogap merges with superconducting fluctuations above the critical doping.

Results highlight the significance of Mottness in high-$T_c$ superconductivity.

Abstract

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.