论文标题
超过的非武器bi $ _ {1.8} $ pb $ _ {0.4} $ sr $ _2 $ cuo $ _ {6+Δ} $
Hole-Like Fermi Surface in the Overdoped Non-Superconducting Bi$_{1.8}$Pb$_{0.4}$Sr$_2$CuO$_{6+δ}$
论文作者
论文摘要
在高温铜矿超导体中，抗铁磁性自旋波动被认为在自然产生$ d $ - 波通道中的电子之间具有吸引力的相互作用方面具有非常重要的作用。在超导穹顶的过度终点，超导性和自旋波动之间的连接尤其重要。在某些材料中，这一点似乎与Lifshitz的过渡相吻合，那里的Fermi表面从以（$π，π$）为中心的孔变化到类似电子的孔，以$γ$点为中心，导致大型动量抗抗胶电势波动丧失。在这里，我们研究了Bi $ _ {1.8} $ pb $ _ {0.4} $ sr $ _2 $ _2 $ cuo $ _ {6+δ} $在角度分辨光发射中的兴奋剂依赖性，并发现超过掺杂的掺杂量比在其下的掺杂量下的掺杂率降低了。这需要更详细的重新检查自旋 - 拖延场景。
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 ($π, π$) to the electron-like, centered at the $Γ$ point causing a loss of large momentum anti-ferromagnetic fluctuations. Here, we study the doping dependence of the electronic structure of Bi$_{1.8}$Pb$_{0.4}$Sr$_2$CuO$_{6+δ}$ in angle-resolved photoemission and find that the superconductivity vanishes at lower doping than at which the Lifshitz transition occurs. This requires a more detailed re-examination of a spin-fluctuation scenario.
