{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,18]],"date-time":"2026-10-18T01:25:04Z","timestamp":1792286704151,"version":"4.4.0"},"reference-count":16,"publisher":"National Academy of Sciences","issue":"38","content-domain":{"domain":["www.pnas.org"],"crossmark-restriction":true},"short-container-title":["Proc. Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[2008,9,23]]},"abstract":"<jats:p>\n                    The recent discovery of superconductivity with relatively high transition temperature (Tc) in the layered iron-based quaternary oxypnictides La[O\n                    <jats:sub>\n                      1\u2212\n                      <jats:italic>x<\/jats:italic>\n                    <\/jats:sub>\n                    F\n                    <jats:italic>\n                      <jats:sub>x<\/jats:sub>\n                    <\/jats:italic>\n                    ] FeAs by Kamihara\n                    <jats:italic>et al.<\/jats:italic>\n                    [Kamihara Y, Watanabe T, Hirano M, Hosono H (2008) Iron-based layered superconductor La[O1-xFx] FeAs (x = 0.05\u20130.12) with Tc = 26 K.\n                    <jats:italic>J Am Chem Soc<\/jats:italic>\n                    130:3296\u20133297.] was a real surprise and has generated tremendous interest. Although superconductivity exists in alloy that contains the element Fe, LaOMPn (with M = Fe, Ni; and Pn = P and As) is the first system where Fe plays the key role to the occurrence of superconductivity. LaOMPn has a layered crystal structure with an Fe-based plane. It is quite natural to search whether there exists other Fe based planar compounds that exhibit superconductivity. Here, we report the observation of superconductivity with zero-resistance transition temperature at 8 K in the PbO-type \u03b1-FeSe compound. A key observation is that the clean superconducting phase exists only in those samples prepared with intentional Se deficiency. FeSe, compared with LaOFeAs, is less toxic and much easier to handle. What is truly striking is that this compound has the same, perhaps simpler, planar crystal sublattice as the layered oxypnictides. Therefore, this result provides an opportunity to better understand the underlying mechanism of superconductivity in this class of unconventional superconductors.\n                  <\/jats:p>","DOI":"10.1073\/pnas.0807325105","type":"journal-article","created":{"date-parts":[[2008,9,5]],"date-time":"2008-09-05T21:09:19Z","timestamp":1220648959000},"page":"14262-14264","update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":2799,"title":["Superconductivity in the PbO-type structure \u03b1-FeSe"],"prefix":"10.1073","volume":"105","author":[{"given":"Fong-Chi","family":"Hsu","sequence":"first","affiliation":[{"name":"*Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan;"},{"name":"Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiu-Yong","family":"Luo","sequence":"additional","affiliation":[{"name":"*Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kuo-Wei","family":"Yeh","sequence":"additional","affiliation":[{"name":"*Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ta-Kun","family":"Chen","sequence":"additional","affiliation":[{"name":"*Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tzu-Wen","family":"Huang","sequence":"additional","affiliation":[{"name":"*Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Phillip M.","family":"Wu","sequence":"additional","affiliation":[{"name":"Department of Physics, Duke University, Durham, NC 27708"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yong-Chi","family":"Lee","sequence":"additional","affiliation":[{"name":"*Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yi-Lin","family":"Huang","sequence":"additional","affiliation":[{"name":"*Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yan-Yi","family":"Chu","sequence":"additional","affiliation":[{"name":"*Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan;"},{"name":"Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Der-Chung","family":"Yan","sequence":"additional","affiliation":[{"name":"*Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maw-Kuen","family":"Wu","sequence":"additional","affiliation":[{"name":"*Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan;"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"341","published-online":{"date-parts":[[2008,9,23]]},"reference":[{"key":"e_1_3_3_1_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.30.4968"},{"key":"e_1_3_3_2_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja800073m"},{"key":"e_1_3_3_3_2","doi-asserted-by":"publisher","DOI":"10.1038\/nature06972"},{"key":"e_1_3_3_4_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.100.247002"},{"key":"e_1_3_3_5_2","unstructured":"XH Chen et al. Superconductivity at 43 K in samarium-arsenide oxides SmFeAsO1-xFx. arXiv: 0803.3603v2."},{"key":"e_1_3_3_6_2","doi-asserted-by":"publisher","DOI":"10.1007\/s11433-008-0075-9"},{"key":"e_1_3_3_7_2","doi-asserted-by":"publisher","DOI":"10.1209\/0295-5075\/82\/17009"},{"key":"e_1_3_3_8_2","doi-asserted-by":"publisher","DOI":"10.1088\/0953-2048\/21\/8\/082001"},{"key":"e_1_3_3_9_2","doi-asserted-by":"publisher","DOI":"10.1088\/0256-307X\/25\/6\/080"},{"key":"e_1_3_3_10_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF00912781"},{"key":"e_1_3_3_11_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF00910963"},{"key":"e_1_3_3_12_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.58.908"},{"key":"e_1_3_3_13_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF02649932"},{"key":"e_1_3_3_14_2","unstructured":"Y Ishida et al. Evidence for pseudogap evolutions in high-Tc iron oxypnictides. arXiv:0805.2647v1. (2008)."},{"key":"e_1_3_3_15_2","doi-asserted-by":"publisher","DOI":"10.1143\/JPSJ.77.063708"},{"key":"e_1_3_3_16_2","article-title":"Spin ordering in LaOFeAs and its suppression in superconductor LaO0.89F0.11FeAs probed by M\u00f6sssbauer spectroscopy","author":"Kitao S","year":"2008","unstructured":"S Kitao, et al., Spin ordering in LaOFeAs and its suppression in superconductor LaO0.89F0.11FeAs probed by M\u00f6sssbauer spectroscopy. J Phys Soc Jpn, 2008).","journal-title":"J Phys Soc Jpn"}],"container-title":["Proceedings of the National Academy of Sciences"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/pnas.org\/doi\/pdf\/10.1073\/pnas.0807325105","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2022,4,12]],"date-time":"2022-04-12T18:02:13Z","timestamp":1649786533000},"score":1,"resource":{"primary":{"URL":"https:\/\/pnas.org\/doi\/full\/10.1073\/pnas.0807325105"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2008,9,23]]},"references-count":16,"journal-issue":{"issue":"38","published-print":{"date-parts":[[2008,9,23]]}},"alternative-id":["10.1073\/pnas.0807325105"],"URL":"https:\/\/doi.org\/10.1073\/pnas.0807325105","relation":{},"ISSN":["0027-8424","1091-6490"],"issn-type":[{"value":"0027-8424","type":"print"},{"value":"1091-6490","type":"electronic"}],"subject":[],"published":{"date-parts":[[2008,9,23]]},"assertion":[{"value":"2008-07-26","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2008-09-23","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}