Hole-like Fermi surface in the overdoped non-superconducting Bi1.8Pb0.4Sr2CuO6+δ

In high-temperature cuprate superconductors, the anti-ferromagnetic spin fluctuations are thought to have a very important role in naturally producing an attractive interaction between the electrons in the d-wave channel. The connection between superconductivity and spin fluctuations is expected to be especially consequential at the overdoped end point of the superconducting dome. In some materials, that point seems to coincide with a Lifshitz transition, where the Fermi surface changes from the hole-like centered at (pi, pi) to the electron-like, centered at the Gamma point causing a loss of large momentum anti-ferromagnetic fluctuations. Here, we study the doping dependence of the electronic structure of Bi1.8Pb0.4Sr2CuO6+delta in angle-resolved photoemission and find that the superconductivity vanishes at lower doping than that at which the Lifshitz transition occurs. This requires a more detailed re-examination of a spin fluctuation scenario. Copyright (C) 2021 EPLA

Automated summary

The study demonstrates the important role of anti-ferromagnetic spin fluctuations in producing attractive interactions between electrons in high-temperature cuprate superconductors. The connection between superconductivity and spin fluctuations is crucial, especially at the overdoped end point. In some materials, a Lifshitz transition may coincide with this point, leading to a loss of large momentum anti-ferromagnetic fluctuations.