{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,11]],"date-time":"2026-04-11T14:44:17Z","timestamp":1775918657169,"version":"3.50.1"},"reference-count":24,"publisher":"IOP Publishing","issue":"44","license":[{"start":{"date-parts":[[2018,10,12]],"date-time":"2018-10-12T00:00:00Z","timestamp":1539302400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/publishingsupport.iopscience.iop.org\/iop-standard\/v1"},{"start":{"date-parts":[[2018,10,12]],"date-time":"2018-10-12T00:00:00Z","timestamp":1539302400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"funder":[{"DOI":"10.13039\/100006151","name":"Basic Energy Sciences","doi-asserted-by":"crossref","award":["DE-FG02-86ER45268"],"award-info":[{"award-number":["DE-FG02-86ER45268"]}],"id":[{"id":"10.13039\/100006151","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["J. Phys.: Condens. Matter"],"published-print":{"date-parts":[[2018,11,7]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Recent superconducting transition temperatures (\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>c<\/jats:sub>\n                    ) over 100\u2009K for monolayer FeSe on SrTiO\n                    <jats:sub>3<\/jats:sub>\n                    have renewed interest in the bulk parent compound. In KCl:AlCl\n                    <jats:sub>3<\/jats:sub>\n                    flux-transport-grown crystals of FeSe\n                    <jats:sub>0.94<\/jats:sub>\n                    Be\n                    <jats:sub>0.06<\/jats:sub>\n                    , FeSe\n                    <jats:sub>0.97<\/jats:sub>\n                    Be\n                    <jats:sub>0.03<\/jats:sub>\n                    and, for comparison, FeSe, this work reports doping of FeSe using Be\u2014among the smallest of possible dopants, corresponding to an effective \u2018chemical pressure\u2019. According to lattice parameter measurements, 6% Be doping shrank the tetragonal FeSe lattice equivalent to a physical pressure of 0.75\u2009GPa. Using this flux-transport method of sample preparation, 6% of Be was the maximum amount of dopant achievable. At this maximal composition of FeSe\n                    <jats:sub>0.94<\/jats:sub>\n                    Be\n                    <jats:sub>0.06<\/jats:sub>\n                    , the lattice unit cell shrinks by 2.4%,\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>c<\/jats:sub>\n                    \u2014measured in the bulk via specific heat\u2014increases by almost 10%, the\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>c<\/jats:sub>\n                    versus pressure behavior shifts its peak\n                    <jats:inline-formula\/>\n                    downwards by ~1\u2009GPa, the high temperature structural transition around\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>S<\/jats:sub>\n                    \u2009\u2009=\u2009\u200989\u2009K\n                    <jats:italic>increases<\/jats:italic>\n                    by 1.9\u2009K (in contrast to other dopants in FeSe which uniformly\n                    <jats:italic>depress T<\/jats:italic>\n                    <jats:sub>S<\/jats:sub>\n                    ), and the low temperature specific heat\n                    <jats:italic>\u03b3<\/jats:italic>\n                    increases by 10% compared to pure FeSe. Also, upon doping by 6% Be the residual resistivity ratio,\n                    <jats:italic>\u03c1<\/jats:italic>\n                    (300\u2009K)\/\n                    <jats:italic>\u03c1<\/jats:italic>\n                    (\n                    <jats:italic>T<\/jats:italic>\n                    \u2009\u2009\u2192\u2009\u20090), increases by almost a factor of four, while\n                    <jats:italic>\u03c1<\/jats:italic>\n                    (300\u2009K)\/\n                    <jats:italic>\u03c1<\/jats:italic>\n                    (\n                    <jats:inline-formula\/>\n                    ) increases by 50%.\n                  <\/jats:p>","DOI":"10.1088\/1361-648x\/aae3cf","type":"journal-article","created":{"date-parts":[[2018,9,24]],"date-time":"2018-09-24T10:45:15Z","timestamp":1537785915000},"page":"445701","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":3,"title":["Unusual effects of Be doping in the iron-based superconductor FeSe"],"prefix":"10.1088","volume":"30","author":[{"given":"J S","family":"Kim","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"D","family":"VanGennep","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J J","family":"Hamlin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"X","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"A S","family":"Sefat","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7251-1684","authenticated-orcid":false,"given":"G R","family":"Stewart","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"266","published-online":{"date-parts":[[2018,10,12]]},"reference":[{"key":"cmaae3cfbib001","doi-asserted-by":"publisher","first-page":"1589","DOI":"10.1103\/RevModPhys.83.1589","type":"journal-article","volume":"83","author":"Stewart","year":"2011","journal-title":"Rev. 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All rights, including for text and data mining, AI training, and similar technologies, are reserved.","name":"copyright_information","label":"Copyright Information"},{"value":"2018-09-08","name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2018-09-24","name":"date_accepted","label":"Date Accepted","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2018-10-12","name":"date_epub","label":"Online publication date","group":{"name":"publication_dates","label":"Publication dates"}}]}}