{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,26]],"date-time":"2026-09-26T12:29:06Z","timestamp":1790425746177,"version":"4.1.0"},"reference-count":36,"publisher":"National Academy of Sciences","issue":"25","license":[{"start":{"date-parts":[[2019,5,20]],"date-time":"2019-05-20T00:00:00Z","timestamp":1558310400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["www.pnas.org"],"crossmark-restriction":true},"short-container-title":["Proc. Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[2019,6,18]]},"abstract":"<jats:title>Significance<\/jats:title>\n                  <jats:p>\n                    Superconductivity is one of the most mysterious phenomena in nature in that the materials can conduct electrical current without any resistance. The cuprates hold the record high superconducting temperature at room pressure so far, but understanding their superconducting mechanism remains one of the big challenges. Here, we report high-\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>\n                      <jats:italic>c<\/jats:italic>\n                    <\/jats:sub>\n                    superconductivity in Ba\n                    <jats:sub>2<\/jats:sub>\n                    CuO\n                    <jats:sub>\n                      4-\n                      <jats:italic>y<\/jats:italic>\n                    <\/jats:sub>\n                    with two unique features: an exceptionally compressed local octahedron and heavily overdoped hole carriers. These two features are in sharp contrast to the favorable criteria for all previously known cuprate superconductors. Thus, the discovery of high-\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>\n                      <jats:italic>c<\/jats:italic>\n                    <\/jats:sub>\n                    superconductivity in Ba\n                    <jats:sub>2<\/jats:sub>\n                    CuO\n                    <jats:sub>\n                      4-\n                      <jats:italic>y<\/jats:italic>\n                    <\/jats:sub>\n                    calls into question the widely accepted scenario of superconductivity in the cuprates. This discovery provides a direction to search for additional high-\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>\n                      <jats:italic>c<\/jats:italic>\n                    <\/jats:sub>\n                    superconductors.\n                  <\/jats:p>","DOI":"10.1073\/pnas.1900908116","type":"journal-article","created":{"date-parts":[[2019,5,20]],"date-time":"2019-05-20T20:24:33Z","timestamp":1558383873000},"page":"12156-12160","update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":125,"title":["Superconductivity in a unique type of copper oxide"],"prefix":"10.1073","volume":"116","author":[{"given":"W. M.","family":"Li","sequence":"first","affiliation":[{"name":"Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China;"},{"name":"School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China;"},{"name":"Materials Research Lab at Songshan Lake, 523808 Dongguan, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J. F.","family":"Zhao","sequence":"additional","affiliation":[{"name":"Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China;"},{"name":"School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"L. P.","family":"Cao","sequence":"additional","affiliation":[{"name":"Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China;"},{"name":"School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Z.","family":"Hu","sequence":"additional","affiliation":[{"name":"Max Planck Institute for Chemical Physics of Solids, N\u00f6thnitzer Stra\u03b2e 40, 01187 Dresden, Germany;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Q. Z.","family":"Huang","sequence":"additional","affiliation":[{"name":"NIST Center for Neutron Research, Gaithersburg, MD 20899;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"X. C.","family":"Wang","sequence":"additional","affiliation":[{"name":"Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China;"},{"name":"School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China;"},{"name":"Materials Research Lab at Songshan Lake, 523808 Dongguan, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Y.","family":"Liu","sequence":"additional","affiliation":[{"name":"Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China;"},{"name":"School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"G. Q.","family":"Zhao","sequence":"additional","affiliation":[{"name":"Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China;"},{"name":"School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.","family":"Zhang","sequence":"additional","affiliation":[{"name":"Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China;"},{"name":"School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Q. Q.","family":"Liu","sequence":"additional","affiliation":[{"name":"Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China;"},{"name":"School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R. Z.","family":"Yu","sequence":"additional","affiliation":[{"name":"Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China;"},{"name":"School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China;"},{"name":"Materials Research Lab at Songshan Lake, 523808 Dongguan, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Y. W.","family":"Long","sequence":"additional","affiliation":[{"name":"Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China;"},{"name":"School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China;"},{"name":"Materials Research Lab at Songshan Lake, 523808 Dongguan, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H.","family":"Wu","sequence":"additional","affiliation":[{"name":"NIST Center for Neutron Research, Gaithersburg, MD 20899;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H. J.","family":"Lin","sequence":"additional","affiliation":[{"name":"National Synchrotron Radiation Research Center, 30076 Hsinchu, Taiwan;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C. T.","family":"Chen","sequence":"additional","affiliation":[{"name":"National Synchrotron Radiation Research Center, 30076 Hsinchu, Taiwan;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Z.","family":"Li","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering, Nanjing University of Science and Technology, 210094 Nanjing, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Z. Z.","family":"Gong","sequence":"additional","affiliation":[{"name":"Department of Physics, Columbia University, New York, NY 10027;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Z.","family":"Guguchia","sequence":"additional","affiliation":[{"name":"Department of Physics, Columbia University, New York, NY 10027;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J. S.","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Physics, University of Florida, Gainesville, FL 32611;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"G. R.","family":"Stewart","sequence":"additional","affiliation":[{"name":"Department of Physics, University of Florida, Gainesville, FL 32611;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Y. J.","family":"Uemura","sequence":"additional","affiliation":[{"name":"Department of Physics, Columbia University, New York, NY 10027;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S.","family":"Uchida","sequence":"additional","affiliation":[{"name":"Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China;"},{"name":"Department of Physics, University of Tokyo, 113-0033 Tokyo, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C. Q.","family":"Jin","sequence":"additional","affiliation":[{"name":"Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China;"},{"name":"School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China;"},{"name":"Materials Research Lab at Songshan Lake, 523808 Dongguan, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"341","published-online":{"date-parts":[[2019,5,20]]},"reference":[{"key":"e_1_3_3_1_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF01303701"},{"key":"e_1_3_3_2_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.58.908"},{"key":"e_1_3_3_3_2","first-page":"522","article-title":"High T\n                  c superconductivity of Sr(Ba)-La-Cu oxides","volume":"8","author":"Zhao ZX","year":"1987","unstructured":"Zhao ZX, . (1987) High Tc superconductivity of Sr(Ba)-La-Cu oxides. Chin Sci Bull 8:522\u2013525.","journal-title":"Chin Sci Bull"},{"key":"e_1_3_3_4_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.37.3759"},{"key":"e_1_3_3_5_2","doi-asserted-by":"publisher","DOI":"10.1103\/RevModPhys.78.17"},{"key":"e_1_3_3_6_2","doi-asserted-by":"publisher","DOI":"10.1103\/RevModPhys.84.1383"},{"key":"e_1_3_3_7_2","doi-asserted-by":"publisher","DOI":"10.1038\/nature14165"},{"key":"e_1_3_3_8_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.95.077001"},{"key":"e_1_3_3_9_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.43.2968"},{"key":"e_1_3_3_10_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.87.047003"},{"key":"e_1_3_3_11_2","doi-asserted-by":"publisher","DOI":"10.1038\/nphys4248"},{"key":"e_1_3_3_12_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.89.224505"},{"key":"e_1_3_3_13_2","doi-asserted-by":"publisher","DOI":"10.1143\/JJAP.36.L341"},{"key":"e_1_3_3_14_2","doi-asserted-by":"publisher","DOI":"10.1023\/A:1022936227333"},{"key":"e_1_3_3_15_2","doi-asserted-by":"publisher","DOI":"10.1038\/364315a0"},{"key":"e_1_3_3_16_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1151-2916.1995.tb07953.x"},{"key":"e_1_3_3_17_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.86.235111"},{"key":"e_1_3_3_18_2","doi-asserted-by":"publisher","DOI":"10.1038\/375301a0"},{"key":"e_1_3_3_19_2","doi-asserted-by":"publisher","DOI":"10.1007\/978-4-431-68535-7_54"},{"key":"e_1_3_3_20_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.94.180509"},{"key":"e_1_3_3_21_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.35.6716"},{"key":"e_1_3_3_22_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.38.225"},{"key":"e_1_3_3_23_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.52.462"},{"key":"e_1_3_3_24_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.66.104"},{"key":"e_1_3_3_25_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.68.2543"},{"key":"e_1_3_3_26_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.47.3354"},{"key":"e_1_3_3_27_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.57.9550"},{"key":"e_1_3_3_28_2","doi-asserted-by":"publisher","DOI":"10.1209\/epl\/i2002-00168-7"},{"key":"e_1_3_3_29_2","doi-asserted-by":"publisher","DOI":"10.1143\/JJAP.32.4517"},{"key":"e_1_3_3_30_2","doi-asserted-by":"publisher","DOI":"10.1007\/s11434-016-1145-4"},{"key":"e_1_3_3_31_2","doi-asserted-by":"publisher","DOI":"10.1209\/0295-5075\/118\/37004"},{"key":"e_1_3_3_32_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.121.227002"},{"key":"e_1_3_3_33_2","doi-asserted-by":"publisher","DOI":"10.1557\/adv.2017.495"},{"key":"e_1_3_3_34_2","doi-asserted-by":"publisher","DOI":"10.1063\/1.1137207"},{"key":"e_1_3_3_35_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.62.2317"},{"key":"e_1_3_3_36_2","doi-asserted-by":"publisher","DOI":"10.1016\/0921-4534(94)90499-5"}],"container-title":["Proceedings of the National Academy of Sciences"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/pnas.org\/doi\/pdf\/10.1073\/pnas.1900908116","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2022,4,13]],"date-time":"2022-04-13T05:10:13Z","timestamp":1649826613000},"score":1,"resource":{"primary":{"URL":"https:\/\/pnas.org\/doi\/full\/10.1073\/pnas.1900908116"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2019,5,20]]},"references-count":36,"journal-issue":{"issue":"25","published-print":{"date-parts":[[2019,6,18]]}},"alternative-id":["10.1073\/pnas.1900908116"],"URL":"https:\/\/doi.org\/10.1073\/pnas.1900908116","relation":{},"ISSN":["0027-8424","1091-6490"],"issn-type":[{"value":"0027-8424","type":"print"},{"value":"1091-6490","type":"electronic"}],"subject":[],"published":{"date-parts":[[2019,5,20]]},"assertion":[{"value":"2019-05-20","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}