Unveiling phase diagram of the lightly doped high-Tc cuprate superconductors with disorder removed

Kifu Kurokawa, Shunsuke Isono, Yoshimitsu Kohama, So Kunisada, Shiro Sakai, Ryotaro Sekine, Makoto Okubo, Matthew D. Watson, Timur K. Kim, Cephise Cacho, Shik Shin, Takami Tohyama, Kazuyasu Tokiwa () and Takeshi Kondo ()
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Kifu Kurokawa: University of Tokyo
Shunsuke Isono: Tokyo University of Science
Yoshimitsu Kohama: University of Tokyo
So Kunisada: University of Tokyo
Shiro Sakai: RIKEN Center for Emergent Matter Science (CEMS)
Ryotaro Sekine: Tokyo University of Science
Makoto Okubo: Tokyo University of Science
Matthew D. Watson: Diamond Light Source
Timur K. Kim: Diamond Light Source
Cephise Cacho: Diamond Light Source
Shik Shin: University of Tokyo
Takami Tohyama: Tokyo University of Science
Kazuyasu Tokiwa: Tokyo University of Science
Takeshi Kondo: University of Tokyo

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract The currently established electronic phase diagram of cuprates is based on a study of single- and double-layered compounds. These CuO2 planes, however, are directly contacted with dopant layers, thus inevitably disordered with an inhomogeneous electronic state. Here, we solve this issue by investigating a 6-layered Ba2Ca5Cu6O12(F,O)2 with inner CuO2 layers, which are clean with the extremely low disorder, by angle-resolved photoemission spectroscopy (ARPES) and quantum oscillation measurements. We find a tiny Fermi pocket with a doping level less than 1% to exhibit well-defined quasiparticle peaks which surprisingly lack the polaronic feature. This provides the first evidence that the slightest amount of carriers is enough to turn a Mott insulating state into a metallic state with long-lived quasiparticles. By tuning hole carriers, we also find an unexpected phase transition from the superconducting to metallic states at 4%. Our results are distinct from the nodal liquid state with polaronic features proposed as an anomaly of the heavily underdoped cuprates.

Date: 2023
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DOI: 10.1038/s41467-023-39457-7

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