Photoemission studies of BSCCO-2212 across the phase diagram with in-situ control of doping*

I will present angle-resolved photoemission studies of Bi₂Sr₂CaCu₂O_8+δ enabled by oxide MBE [1]. Single crystals were cleaved and annealed in ultra-high vacuum or in ozone (O₃) to reduce or increase the doping level. Photoemission studies have been carried out on a wide range of dopings spanning the superconducting dome and covering the previously inaccessible, metallic, non-superconducting phase on the overdoped side (OD0K). This allowed us to study the evolution of the Fermi surface with doping [2], the reconstruction of the Fermi surface due to the superstructure modulation [3], and the renormalization of the electronic spectrum concomitant with the onset of superconductivity [4]. In this talk, I will focus on the sample preparation aspects and cover the first two results.

[1] "In-situ ARPES of copper-oxide thin films synthesized by MBE", JESRP (2018), https://doi.org/10.1016/j.elspec.2018.07.003
[2] "Phase diagram of BSCCO revisited", Nature Communications (2018), https://doi.org/10.1038/s41467-018-07686-w
[3] "Reconstruction of the BSCCO Fermi surface", arXiv (2019), https://arxiv.org/abs/1909.11645
[4] "Disappearance of superconductivity due to vanishing coupling in the overdoped BSCCO", arXiv (2019), https://arxiv.org/abs/1905.01370