{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1360565166808532736.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1038/srep02235"}},{"identifier":{"@type":"URI","@value":"https://www.nature.com/articles/srep02235"}},{"identifier":{"@type":"URI","@value":"https://www.nature.com/articles/srep02235.pdf"}},{"identifier":{"@type":"PMID","@value":"23887134"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Emerging superconductivity hidden beneath charge-transfer insulators"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>In many of today's most interesting materials, strong interactions prevail upon the magnetic moments, the electrons and the crystal lattice, forming strong links between these different aspects of the system. Particularly, in two-dimensional cuprates, where copper is either five- or six-fold coordinated, superconductivity is commonly induced by chemical doping which is deemed to be mandatory by destruction of long-range antiferromagnetic order of 3<jats:italic>d</jats:italic><jats:sup>9</jats:sup> Cu<jats:sup>2+</jats:sup> moments. Here we show that superconductivity can be induced in Pr<jats:sub>2</jats:sub>CuO<jats:sub>4</jats:sub>, where copper is four-fold coordinated. We induced this novel quantum state of Pr<jats:sub>2</jats:sub>CuO<jats:sub>4</jats:sub> by realizing pristine square-planar coordinated copper in the copper-oxygen planes, thus, resulting in critical superconducting temperatures even higher than by chemical doping. Our results demonstrate new degrees of freedom, i.e., coordination of copper, for the manipulation of magnetic and superconducting order parameters in quantum materials.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380847869977611652","@type":"Researcher","foaf:name":[{"@value":"Yoshiharu Krockenberger"}]},{"@id":"https://cir.nii.ac.jp/crid/1380847869977611650","@type":"Researcher","foaf:name":[{"@value":"Hiroshi Irie"}]},{"@id":"https://cir.nii.ac.jp/crid/1380847869977611655","@type":"Researcher","foaf:name":[{"@value":"Osamu Matsumoto"}]},{"@id":"https://cir.nii.ac.jp/crid/1380847869977611651","@type":"Researcher","foaf:name":[{"@value":"Keitaro Yamagami"}]},{"@id":"https://cir.nii.ac.jp/crid/1380847869977611653","@type":"Researcher","foaf:name":[{"@value":"Akio Tsukada"}]},{"@id":"https://cir.nii.ac.jp/crid/1380847869977611654","@type":"Researcher","foaf:name":[{"@value":"Masaya 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display=\"inline\"><mml:mrow><mml:msub><mml:mrow><mml:mi>Nd</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>\n Superconducting Thin Films Studied by Hard X-Ray Photoemission and Soft X-Ray Absorption Spectroscopy"}]},{"@id":"https://cir.nii.ac.jp/crid/1360292619596402176","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Stoichiometry control of atomic beam fluxes by precipitated impurity phase detection in growth of (Pr,Ce)2CuO4 and (La,Sr)2CuO4 films"}]},{"@id":"https://cir.nii.ac.jp/crid/1360292620190585216","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Superconductivity phase diagrams for the electron-doped cuprates<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><mml:mrow><mml:msub><mml:mi>R</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant=\"normal\">Ce</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi mathvariant=\"normal\">Cu</mml:mi><mml:msub><mml:mi mathvariant=\"normal\">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>(<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><mml:mrow><mml:mi>R</mml:mi><mml:mo>=</mml:mo><mml:mi mathvariant=\"normal\">La</mml:mi></mml:mrow></mml:math>, Pr, Nd, Sm, and Eu)"}]},{"@id":"https://cir.nii.ac.jp/crid/1360292620619966592","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Metal-insulator quantum critical point beneath the high\n            <i>T</i>\n            <sub>c</sub>\n            superconducting 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display=\"inline\"><mml:mrow><mml:msub><mml:mrow><mml:mi>Pr</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:mrow><mml:msub><mml:mrow><mml:mi>LaCe</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>−</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:mrow></mml:math>\n and Possible Absence of Disparity between Electron- and Hole-Doped Cuprate Phase Diagrams"}]},{"@id":"https://cir.nii.ac.jp/crid/1360566399837791616","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"As-grown superconducting Pr<sub>2</sub>CuO<sub>4</sub>under thermodynamic constraints"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567183491012096","@type":"Article","resourceType":"学術雑誌論文(journal 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display=\"inline\"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=\"normal\">Pr</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>crystal-field excitation study of apical oxygen and reduction processes in<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=\"normal\">Pr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=\"normal\">Ce</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi 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