{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,1,23]],"date-time":"2025-01-23T05:20:09Z","timestamp":1737609609381,"version":"3.33.0"},"reference-count":43,"publisher":"IOP Publishing","issue":"11","license":[{"start":{"date-parts":[[2025,1,22]],"date-time":"2025-01-22T00:00:00Z","timestamp":1737504000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/page\/copyright"},{"start":{"date-parts":[[2025,1,22]],"date-time":"2025-01-22T00:00:00Z","timestamp":1737504000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"funder":[{"DOI":"10.13039\/501100001409","name":"Department of Science and Technology, Ministry of Science and Technology, India","doi-asserted-by":"publisher","award":["CRG\/2019\/003522"],"award-info":[{"award-number":["CRG\/2019\/003522"]}],"id":[{"id":"10.13039\/501100001409","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["J. Phys.: Condens. Matter"],"published-print":{"date-parts":[[2025,3,17]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>An exotic quantum mechanical ground state, i.e. the non-magnetic <jats:italic>J<\/jats:italic>\n                  <jats:sub>eff<\/jats:sub> = 0 state, has been predicted for higher transition metal <jats:inline-formula>\n                     <jats:tex-math\/>\n                     <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:mrow>\n                           <mml:msubsup>\n                              <mml:mi>t<\/mml:mi>\n                              <mml:mrow>\n                                 <mml:mn>2<\/mml:mn>\n                                 <mml:mi>g<\/mml:mi>\n                              <\/mml:mrow>\n                              <mml:mrow>\n                                 <mml:mn>4<\/mml:mn>\n                              <\/mml:mrow>\n                           <\/mml:msubsup>\n                        <\/mml:mrow>\n                     <\/mml:math>\n                  <\/jats:inline-formula> systems, due to the influence of strong spin\u2013orbit coupling (SOC) or in other words, due to unquenched orbital moment contribution. However, previous attempts to experimentally realize such a state in 5<jats:italic>d<\/jats:italic>\n                  <jats:sup>4<\/jats:sup> systems had mostly been clouded by solid-state effects or the reduced strength of the renormalized SOC that might allow significant triplon condensation. Interestingly, a recent study on vacancy ordered double perovskite compound K<jats:sub>2<\/jats:sub>RuCl<jats:sub>6<\/jats:sub> by Takahashi <jats:italic>et al<\/jats:italic> (2021 <jats:italic>Phys. Rev. Lett.<\/jats:italic>\n                  <jats:bold>127<\/jats:bold> 227201) concluded that even within <jats:italic>LS<\/jats:italic> coupling regime the Ru<jats:sup>4+<\/jats:sup> 4<jats:italic>d<\/jats:italic>\n                  <jats:sup>4<\/jats:sup> ions, within isolated RuCl<jats:sub>6<\/jats:sub> octahedra, strongly accommodate <jats:italic>J<\/jats:italic> multiplets having <jats:italic>J<\/jats:italic>\n                  <jats:sub>eff<\/jats:sub> = 0 as the ground state with weakly interacting <jats:italic>J<\/jats:italic>\n                  <jats:sub>eff<\/jats:sub> = 1 excitation, due to large unquenced Ru orbital angular momentum in the system. In the present report, we show results from the double perovskite La<jats:sub>2<\/jats:sub>ZnRuO<jats:sub>6<\/jats:sub>, where Ru<jats:sup>4+<\/jats:sup> ions form isolated RuO<jats:sub>6<\/jats:sub> octahedra but unlike K<jats:sub>2<\/jats:sub>RuCl<jats:sub>6<\/jats:sub>, they remain chemically connected via corner-sharing with nonmagnetic ZnO<jats:sub>6<\/jats:sub> octahedra. Next, we move on to separate out the RuO<jats:sub>6<\/jats:sub> octahedra further by doping the Ru-site with Ti<jats:sup>4+<\/jats:sup>, in order to probe the character of the Ru<jats:sup>4+<\/jats:sup> ions within a different structural background. We find that the system stabilizes in <jats:italic>P<\/jats:italic>2<jats:inline-formula>\n                     <jats:tex-math\/>\n                     <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:mrow>\n                           <mml:msub>\n                              <mml:mrow\/>\n                              <mml:mn>1<\/mml:mn>\n                           <\/mml:msub>\n                           <mml:mo>\/<\/mml:mo>\n                           <mml:mi>n<\/mml:mi>\n                        <\/mml:mrow>\n                     <\/mml:math>\n                  <\/jats:inline-formula> space group with tilted octahedra without distortion as has been confirmed by the x-ray powder diffraction and x-ray absorption spectroscopic studies. Interestingly, the x-ray photoelectron spectroscopic valance band spectra indicated certain inhomogeneity around the half-doping region, while confirming insulating ground state for all. Moreover, unlike the vacancy ordered double perovskite cases, it is observed that here the Ru orbital angular momentum gets substantially quenched and only the Ru spin magnetic moments are realized.<\/jats:p>","DOI":"10.1088\/1361-648x\/ada679","type":"journal-article","created":{"date-parts":[[2025,1,6]],"date-time":"2025-01-06T23:01:27Z","timestamp":1736204487000},"page":"115804","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Hybridization effects on the magnetic ground state of ruthenium in double perovskite La<sub>2<\/sub>ZnRu<sub>1\u2212x<\/sub>Ti<sub>x<\/sub>O<sub>6<\/sub>"],"prefix":"10.1088","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6008-415X","authenticated-orcid":true,"given":"Shuvajit","family":"Halder","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4846-8422","authenticated-orcid":true,"given":"Carlo","family":"Meneghini","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7180-1241","authenticated-orcid":true,"given":"Sugata","family":"Ray","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"266","published-online":{"date-parts":[[2025,1,22]]},"reference":[{"key":"cmada679bib1","doi-asserted-by":"publisher","first-page":"57","DOI":"10.1146\/annurev-conmatphys-020911-125138","volume":"5","author":"Witczak-Krempa","year":"2014","journal-title":"Annu. 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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":"2024-07-31","name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2025-01-06","name":"date_accepted","label":"Date Accepted","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2025-01-22","name":"date_epub","label":"Online publication date","group":{"name":"publication_dates","label":"Publication dates"}}]}}