{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T17:52:53Z","timestamp":1792086773773,"version":"4.4.0"},"reference-count":42,"publisher":"National Academy of Sciences","issue":"42","license":[{"start":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T00:00:00Z","timestamp":1792022400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100006168","name":"DOE | National Nuclear Security Administration","doi-asserted-by":"publisher","award":["DE-NA0004235"],"award-info":[{"award-number":["DE-NA0004235"]}],"id":[{"id":"10.13039\/100006168","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100006132","name":"DOE | Office of Science","doi-asserted-by":"publisher","award":["DE-FG02-04ER46105"],"award-info":[{"award-number":["DE-FG02-04ER46105"]}],"id":[{"id":"10.13039\/100006132","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100006132","name":"DOE | Office of Science","doi-asserted-by":"publisher","award":["DE-SC0023648"],"award-info":[{"award-number":["DE-SC0023648"]}],"id":[{"id":"10.13039\/100006132","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["www.pnas.org"],"crossmark-restriction":true},"short-container-title":["Proc. Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[2026,10,20]]},"abstract":"\n Electrical transport and magnetic measurements have been made on UTe\n 2<\/jats:sub>\n under pressure\n P<\/jats:italic>\n up to ~16 GPa to determine the superconducting transition temperature\n T<\/jats:italic>\n c<\/jats:sub>\n vs.\n P<\/jats:italic>\n phase diagram in the high-pressure tetragonal phase. Superconductivity emerges near ~5 GPa, coincident with the orthorhombic\u2014tetragonal phase transition; in the tetragonal phase,\n T<\/jats:italic>\n c<\/jats:sub>\n reaches a maximum value of ~4 K at 6 GPa and then decreases with\n P<\/jats:italic>\n and appears to vanish near 18 GPa. Tetragonal UTe\n 2<\/jats:sub>\n has a relatively small upper critical field\n H<\/jats:italic>\n c2<\/jats:sub>\n (0) \u2248 1.2 T at 5.3 GPa, smaller than the Pauli paramagnetic limit, and is orbitally limited with a coherence length \u03be\n tetra<\/jats:sub>\n \u2248 16.5 nm. This small value of\n H<\/jats:italic>\n c2<\/jats:sub>\n (0) favors more conventional superconductivity; in contrast, the large values of\n H<\/jats:italic>\n c2<\/jats:sub>\n (\n T<\/jats:italic>\n ) for orthorhombic UTe\n 2<\/jats:sub>\n exceed the Pauli paramagnetic limit in all three crystallographic directions and have been attributed to unconventional superconductivity, widely believed to involve spin-triplet pairing. The temperature\u2013pressure phase diagram of UTe\n 2<\/jats:sub>\n shows a striking dichotomy: a narrow, fragile, unconventional superconducting region in the orthorhombic phase vs. a broad, robust, and more conventional superconducting dome in the tetragonal phase. This dichotomy is consistent with the proposal that U-dimers, present (absent) in the orthorhombic (tetragonal) phase, may play a role in spin-triplet superconductivity of orthorhombic UTe\n 2<\/jats:sub>\n . In the tetragonal phase, the normal-state electrical resistivity \u03c1(\n T<\/jats:italic>\n ) exhibits metallic behavior with a \u201cknee\u201d at 200 to 240 K that depends weakly on\n P<\/jats:italic>\n and most likely marks the onset of a transition to a magnetically ordered phase that coexists with superconductivity.\n <\/jats:p>","DOI":"10.1073\/pnas.2621369123","type":"journal-article","created":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T17:37:33Z","timestamp":1792085853000},"update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":0,"title":["Superconductivity in the high-pressure tetragonal phase of UTe\n 2<\/sub>"],"prefix":"10.1073","volume":"123","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2937-0609","authenticated-orcid":false,"given":"Yuhang","family":"Deng","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0168r3w48","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of Physics, University of California San Diego","place":["La Jolla"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabriel","family":"Mee","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0168r3w48","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of Physics, University of California San Diego","place":["La Jolla"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tyler","family":"Wannamaker","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0168r3w48","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of Physics, University of California San Diego","place":["La Jolla"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Keke","family":"Feng","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0168r3w48","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of Physics, University of California San Diego","place":["La Jolla"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mingyu","family":"Xu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05hs6h993","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of Chemistry, Michigan State University","place":["East Lansing"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weiwei","family":"Xie","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05hs6h993","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of Chemistry, Michigan State University","place":["East Lansing"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5909-6057","authenticated-orcid":false,"given":"M. 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