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

• Published in: Physical review. B 2022-02, Vol.105 (8)
• Main Authors: Harada, Keiichi, Teramoto, Yuki, Usui, Tomohiro, Itaka, Kenji, Fujii, Takenori, Noji, Takashi, Taniguchi, Haruka, Matsukawa, Michiaki, Ishikawa, Hajime, Kindo, Koichi, Dessau, Daniel S., Watanabe, Takao
• Format: Article
• Language: English
• Subjects: annealing; Boltzmann theory; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; cuprates; electrical conductivity; high-temperature superconductors; impurities in superconductors; MATERIALS SCIENCE; pseudogap; resistivity measurements; single crystal materials; superconducting fluctuations; superconducting gap; superconducting phase transition
• ISSN: 2469-9950; 2469-9969
• DOI: 10.1103/PhysRevB.105.085131

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. Her the results indicate the importance of Mottness in high-Tc superconductivity.