{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,3]],"date-time":"2026-07-03T12:17:12Z","timestamp":1783081032635,"version":"3.54.6"},"reference-count":34,"publisher":"IOP Publishing","issue":"3","license":[{"start":{"date-parts":[[2022,11,16]],"date-time":"2022-11-16T00:00:00Z","timestamp":1668556800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/publishingsupport.iopscience.iop.org\/iop-standard\/v1"},{"start":{"date-parts":[[2022,11,16]],"date-time":"2022-11-16T00:00:00Z","timestamp":1668556800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"funder":[{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"crossref","award":["20H01858"],"award-info":[{"award-number":["20H01858"]}],"id":[{"id":"10.13039\/501100001691","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":[[2023,1,25]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>The 5<jats:italic>d<\/jats:italic> pyrochlore oxide superconductor Cd<jats:sub>2<\/jats:sub>Re<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub> (CRO) has attracted significant interest as a spin\u2013orbit-coupled metal (SOCM) that spontaneously undergoes a phase transition to an odd-parity multipole phase by breaking the spatial inversion symmetry due to the Fermi liquid instability caused by strong spin\u2013orbit coupling. Despite the significance of structural information during the transition, previous experimental results regarding lattice deformation have been elusive. We have conducted ultra-high resolution synchrotron radiation x-ray diffraction experiments on a high-quality CRO single crystal. The temperature-dependent splitting of the 0 0 16 and 0 0 14 reflections, which are allowed and forbidden, respectively, in the high-temperature cubic phase I (space group <jats:italic>Fd<\/jats:italic>\u20133<jats:italic>m<\/jats:italic>), has been clearly observed and reveals the following significant facts: inversion symmetry breaking and tetragonal distortion occur simultaneously at <jats:italic>T<\/jats:italic>\n                  <jats:sub>s1<\/jats:sub> = 201.5(1) K; the previously believed first-order transition between phase II (<jats:italic>I<\/jats:italic>\u20134<jats:italic>m<\/jats:italic>2) and phase III (<jats:italic>I<\/jats:italic>4<jats:sub>1<\/jats:sub>22) at <jats:italic>T<\/jats:italic>\n                  <jats:sub>s2<\/jats:sub> \u223c120 K consists of two close second-order transitions at <jats:italic>T<\/jats:italic>\n                  <jats:sub>s2<\/jats:sub> = 115.4(1) K and <jats:italic>T<\/jats:italic>\n                  <jats:sub>s3<\/jats:sub> \u223c 100 K; there is a new orthorhombic phase XI (<jats:italic>F<\/jats:italic>222) in between. The order parameters (OPs) of these continuous transitions are uniquely represented by a two-dimensional irreducible representation <jats:italic>E<jats:sub>u<\/jats:sub>\n                  <\/jats:italic> of the <jats:italic>O<jats:sub>h<\/jats:sub>\n                  <\/jats:italic> point group, and the OPs of phase XI are a linear combination of those of phases II and III. Each phase is believed to correspond to a distinct odd-parity multipole order, and the complex successive transitions observed may be the result of an electronic phase transition that resolves the Fermi liquid instability in the SOCM.<\/jats:p>","DOI":"10.1088\/1361-648x\/aca05e","type":"journal-article","created":{"date-parts":[[2022,11,4]],"date-time":"2022-11-04T18:24:17Z","timestamp":1667586257000},"page":"035403","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":9,"title":["Successive phase transitions of the spin\u2013orbit-coupled metal Cd<sub>2<\/sub>Re<sub>2<\/sub>O<sub>7<\/sub> probed by high-resolution synchrotron x-ray diffraction"],"prefix":"10.1088","volume":"35","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2883-4376","authenticated-orcid":true,"given":"Daigorou","family":"Hirai","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Atsuhito","family":"Fukui","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3816-9584","authenticated-orcid":false,"given":"Hajime","family":"Sagayama","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takumi","family":"Hasegawa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1190-2344","authenticated-orcid":true,"given":"Zenji","family":"Hiroi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2022,11,16]]},"reference":[{"key":"cmaca05ebib1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.115.026401","type":"journal-article","volume":"115","author":"Fu","year":"2015","journal-title":"Phys. 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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":"2022-07-29","name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2022-11-04","name":"date_accepted","label":"Date Accepted","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2022-11-16","name":"date_epub","label":"Online publication date","group":{"name":"publication_dates","label":"Publication dates"}}]}}