Unveiling phase diagram of the lightly doped high-T c cuprate superconductors with disorder removed.

Autor: Kurokawa K; ISSP, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan., Isono S; Department of Applied Electronics, Tokyo University of Science, Tokyo, 125-8585, Japan., Kohama Y; ISSP, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan., Kunisada S; ISSP, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan., Sakai S; RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan., Sekine R; Department of Applied Electronics, Tokyo University of Science, Tokyo, 125-8585, Japan., Okubo M; Department of Applied Electronics, Tokyo University of Science, Tokyo, 125-8585, Japan., Watson MD; Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, United Kingdom., Kim TK; Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, United Kingdom., Cacho C; Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, United Kingdom., Shin S; ISSP, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan.; Office of University Professor, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan., Tohyama T; Department of Applied Physics, Tokyo University of Science, Tokyo, 125-8585, Japan., Tokiwa K; Department of Applied Electronics, Tokyo University of Science, Tokyo, 125-8585, Japan. tokiwa@rs.tus.ac.jp., Kondo T; ISSP, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan. kondo1215@issp.u-tokyo.ac.jp.; Trans-scale Quantum Science Institute, The University of Tokyo, Bunkyo-ku, Tokyo, 113-0033, Japan. kondo1215@issp.u-tokyo.ac.jp.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2023 Jul 14; Vol. 14 (1), pp. 4064. Date of Electronic Publication: 2023 Jul 14.
DOI: 10.1038/s41467-023-39457-7
Abstrakt: The currently established electronic phase diagram of cuprates is based on a study of single- and double-layered compounds. These CuO 2 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 Ba 2 Ca 5 Cu 6 O 12 (F,O) 2 with inner CuO 2 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.
(© 2023. The Author(s).)
Databáze: MEDLINE
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