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Phys.: Condens. Matter"],"published-print":{"date-parts":[[2025,9,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>4<jats:italic>d<\/jats:italic> transition metal oxide offers an intriguing puzzle for its electronic and magnetic ground state. They are in the crossover regime of strong spin\u2013orbit interaction (SOI) and electron\u2013electron correlation (<jats:italic>U<\/jats:italic>) with quenched orbital angular momentum. Our work unravels the electronic and magnetic ground state of the less investigated 4<jats:italic>d<\/jats:italic>\n                  <jats:sup>3<\/jats:sup> double perovskite ruthenates A<jats:sub>2<\/jats:sub>LaRuO<jats:sub>6<\/jats:sub> (A = Ca, Ba). The negligible effect of SOI is evident from the bulk magnetic, specific heat measurements, and density functional theory (DFT) calculations, indicating a classical spin-only magnetic ground state (<jats:italic>S<\/jats:italic> = 3\/2) for the materials. Magnetization measurements show that both materials have long-range antiferromagnetic order with a high degree of magnetic frustration (<jats:italic>f<\/jats:italic> \u224813\u221215). Interestingly, a near <jats:italic>T<\/jats:italic>\n                  <jats:sup>2<\/jats:sup>- behavior is observed in low-<jats:italic>T<\/jats:italic> magnetic heat capacity measurement, indicating the presence of low-dimensional spin wave excitation and magnetic frustration in both materials. The temperature-dependent resistivity measurements and electronic band structure calculations confirm a conventional Mott insulating ground state in these two systems. Moreover, our experimental investigation and DFT calculations highlight the reason for the nonexistence of Sr<jats:sub>2<\/jats:sub>LaRuO<jats:sub>6<\/jats:sub>.<\/jats:p>","DOI":"10.1088\/1361-648x\/adfb3d","type":"journal-article","created":{"date-parts":[[2025,8,13]],"date-time":"2025-08-13T22:54:58Z","timestamp":1755125698000},"page":"355602","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Electronic and magnetic ground state of 4<i>d<\/i>\n                  <sup>3<\/sup> double perovskite ruthenates A<sub>2<\/sub>LaRuO<sub>6<\/sub> (A = Ca, Sr, Ba)"],"prefix":"10.1088","volume":"37","author":[{"given":"Asha","family":"Ann Abraham","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6635-9038","authenticated-orcid":true,"given":"Roumita","family":"Roy","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ruta","family":"Kulkarni","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0215-9205","authenticated-orcid":true,"given":"Sudipta","family":"Kanungo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6279-3497","authenticated-orcid":true,"given":"Soham","family":"Manni","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"266","published-online":{"date-parts":[[2025,8,29]]},"reference":[{"key":"cmadfb3dbib1","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":"2025-03-06","name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2025-08-13","name":"date_accepted","label":"Date Accepted","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2025-08-29","name":"date_epub","label":"Online publication date","group":{"name":"publication_dates","label":"Publication dates"}}]}}