Hole-like Fermi surface in the overdoped non-superconducting Bi_1.8 Pb_0.4 Sr₂CuO_6+δ

¹ Condensed Matter Physics and Materials Science Department, Brookhaven National Lab - Upton, NY 11973, USA
² Institute of Physics - Bijenička 46, HR-10000 Zagreb, Croatia
³ Faculty of Science, Department of Physics, University of Split - Rudjera Boškovića 33, HR-21000 Split, Croatia
⁴ Department of Physics, Princeton University - Princeton, NJ 08544, USA

^(a) valla@bnl.gov (corresponding author)

Received: 23 December 2020
Accepted: 26 February 2021

Abstract

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 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_1.8Pb_0.4Sr₂CuO 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.