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

DOI: 10.1038/s41467-023-39457-7 DOI Help

Authors: 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)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Communications , VOL 14

State: Published (Approved)
Published: July 2023
Diamond Proposal Number(s): 30646 , 28930

Open Access Open Access

Abstract: he 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.

Subject Areas: Materials, Physics

Instruments: I05-ARPES

Added On: 16/07/2023 21:41


Discipline Tags:

Superconductors Quantum Materials Hard condensed matter - electronic properties Physics Materials Science

Technical Tags:

Spectroscopy Angle Resolved Photoemission Spectroscopy (ARPES) High Resolution ARPES (HR-ARPES)