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I05-ARPES	Observation of small Fermi pockets protected by clean CuO2 sheets of a high-Tc superconductor So Kunisada , Shunsuke Isono , Yoshimitsu Kohama , Shiro Sakai , Cédric Bareille , Shunsuke Sakuragi , Ryo Noguchi , Kifu Kurokawa , Kenta Kuroda , Yukiaki Ishida , Shintaro Adachi , Ryotaro Sekine , Timur K. Kim , Cephise Cacho , Shik Shin , Takami Tohyama , Kazuyasu Tokiwa , Takeshi Kondo Science 369, 833-838 DOI: 10.1126/science.aay7311 Diamond Proposal Number(s): [20445, 20446] Show Abstract ▼ Abstract: In cuprate superconductors with high critical transition temperature (Tc), light hole-doping to the parent compound, which is an antiferromagnetic Mott insulator, has been predicted to lead to the formation of small Fermi pockets. These pockets, however, have not been observed. Here, we investigate the electronic structure of the five-layered Ba2Ca4Cu5O10(F,O)2, which has inner copper oxide (CuO2) planes with extremely low disorder, and find small Fermi pockets centered at (π/2, π/2) of the Brillouin zone by angle-resolved photoemission spectroscopy and quantum oscillation measurements. The d-wave superconducting gap opens along the pocket, revealing the coexistence between superconductivity and antiferromagnetic ordering in the same CuO2 sheet. These data further indicate that superconductivity can occur without contribution from the antinodal region around (π, 0), which is shared by other competing excitations.	Aug 2020

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