{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/80479"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/80479","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Complex Phase Behavior of Exotic Oxides: Optical Spectroscopy Studies","abstract":"We observed that the metal-insulator transition in Ca3Ru 2O7 is characterized by the opening of correlation charge gap. The out-of-phase c-axis oxygen vibration phonon mode is seen to be closely associated with the metal-insulator transition possibly by modulating the bandwidth of the system. We also observed Raman scattering from two-magnon excitations in the antiferromagnetic phase of Ca3Ru 2O7, from which we could estimate the in-plane spin-spin exchange coupling constant J∥. Importantly, we found that Ca3Ru2O7 does not exhibit strong in-plane magnetic correlations above TN.","abstract_html":"We observed that the metal-insulator transition in Ca3Ru 2O7 is characterized by the opening of correlation charge gap. The out-of-phase c-axis oxygen vibration phonon mode is seen to be closely associated with the metal-insulator transition possibly by modulating the bandwidth of the system. We also observed Raman scattering from two-magnon excitations in the antiferromagnetic phase of Ca3Ru 2O7, from which we could estimate the in-plane spin-spin exchange coupling constant J∥. Importantly, we found that Ca3Ru2O7 does not exhibit strong in-plane magnetic correlations above TN.","abstract_has_math":false,"creators":["Yoon, Seokhyun"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Cooper, S.L."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-25T20:02:40Z","date_published":"2015-09-25T20:02:40Z","updated_at":"2026-07-22T22:26:14Z","subjects":["Physics, Condensed Matter"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3030497"],"render_values":[{"text":"(MiAaPQ)AAI3030497","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/80479","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Cooper, S.L."]},{"key":"dc:creator","label":"Author","values":["Yoon, Seokhyun"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-25T20:02:40Z","10000-01-01","2001"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Physics, Condensed Matter"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/80479","(MiAaPQ)AAI3030497"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["We observed that the metal-insulator transition in Ca3Ru 2O7 is characterized by the opening of correlation charge gap. The out-of-phase c-axis oxygen vibration phonon mode is seen to be closely associated with the metal-insulator transition possibly by modulating the bandwidth of the system. We also observed Raman scattering from two-magnon excitations in the antiferromagnetic phase of Ca3Ru 2O7, from which we could estimate the in-plane spin-spin exchange coupling constant J∥. Importantly, we found that Ca3Ru2O7 does not exhibit strong in-plane magnetic correlations above TN.","Made available in DSpace on 2015-09-25T20:02:40Z (GMT). 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The out-of-phase c-axis oxygen vibration phonon mode is seen to be closely associated with the metal-insulator transition possibly by modulating the bandwidth of the system. We also observed Raman scattering from two-magnon excitations in the antiferromagnetic phase of Ca3Ru 2O7, from which we could estimate the in-plane spin-spin exchange coupling constant J∥. Importantly, we found that Ca3Ru2O7 does not exhibit strong in-plane magnetic correlations above TN.","Made available in DSpace on 2015-09-25T20:02:40Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3030497.pdf: 5884377 bytes, checksum: e8a801e16f30e1ae09aa605c172ba11d (MD5) Previous issue date: 2001","Embargo set by: Seth Robbins for item 81761 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","123 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2001."],"dc:identifier":["http://hdl.handle.net/2142/80479","(MiAaPQ)AAI3030497"],"dc:language":["eng"],"dc:subject":["Physics, Condensed Matter"],"dc:title":["Complex Phase Behavior of Exotic Oxides: Optical Spectroscopy Studies"],"dc:type":["text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:14Z"}