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

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...

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Main Authors: 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, Takeshi Kondo
Format: Article
Language:English
Published: Nature Portfolio 2023-07-01
Series:Nature Communications
Online Access:https://doi.org/10.1038/s41467-023-39457-7
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author 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
Takeshi Kondo
author_facet 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
Takeshi Kondo
author_sort Kifu Kurokawa
collection DOAJ
description 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.
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spelling doaj.art-9c5623e671c64a4c81b4d2dacfec1c862023-07-16T11:22:11ZengNature PortfolioNature Communications2041-17232023-07-011411910.1038/s41467-023-39457-7Unveiling phase diagram of the lightly doped high-T c cuprate superconductors with disorder removedKifu Kurokawa0Shunsuke Isono1Yoshimitsu Kohama2So Kunisada3Shiro Sakai4Ryotaro Sekine5Makoto Okubo6Matthew D. Watson7Timur K. Kim8Cephise Cacho9Shik Shin10Takami Tohyama11Kazuyasu Tokiwa12Takeshi Kondo13ISSP, University of TokyoDepartment of Applied Electronics, Tokyo University of ScienceISSP, University of TokyoISSP, University of TokyoRIKEN Center for Emergent Matter Science (CEMS)Department of Applied Electronics, Tokyo University of ScienceDepartment of Applied Electronics, Tokyo University of ScienceDiamond Light SourceDiamond Light SourceDiamond Light SourceISSP, University of TokyoDepartment of Applied Physics, Tokyo University of ScienceDepartment of Applied Electronics, Tokyo University of ScienceISSP, University of TokyoAbstract 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.https://doi.org/10.1038/s41467-023-39457-7
spellingShingle 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
Takeshi Kondo
Unveiling phase diagram of the lightly doped high-T c cuprate superconductors with disorder removed
Nature Communications
title Unveiling phase diagram of the lightly doped high-T c cuprate superconductors with disorder removed
title_full Unveiling phase diagram of the lightly doped high-T c cuprate superconductors with disorder removed
title_fullStr Unveiling phase diagram of the lightly doped high-T c cuprate superconductors with disorder removed
title_full_unstemmed Unveiling phase diagram of the lightly doped high-T c cuprate superconductors with disorder removed
title_short Unveiling phase diagram of the lightly doped high-T c cuprate superconductors with disorder removed
title_sort unveiling phase diagram of the lightly doped high t c cuprate superconductors with disorder removed
url https://doi.org/10.1038/s41467-023-39457-7
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