{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/101467"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/101467","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Beyond the isotropic two-dimensional Heisenberg model: Raman scattering studies of the transition between isotropic and anisotropic spin dynamics in Sr2IrO4","abstract":"With discovery of novel superconductivity in Sr2RuO4 and the exciting theoretical results regarding strong spin-orbit couple regime, iridate compounds have come to a focus in many experimental and theoretical studies. Especially, Sr2IrO4 has come to special interest due to 3-d parent compoun La2CuO4. Understanding the similarity and difference in the two compounds are crucial toward search for novel superconductivity in Sr2IrO4 compounds. In this thesis we present inelastic scattering study of the Sr2IrO4 under high magentic field, high presure and temperature. The magnetic field study showed disticntively two different regimes as a function of applied in-plane external field. For moderately high magnetic fiels, H>1.5 T, Sr2IrO4 magnetic mode shows behavior consistent with S=1/2 2D Heisenberg model. However, for H<1.5 T, it shows anisotropic behavior as a function of external field due to interlayer couling. Ths study showed that while for even for moderate field, the magentic behavior is consistent with suggested two-dimensional effective S=1/2 Hamiltonian, for in low fields it showed anisotropic behavior. For future studies, the important role of the interlayer coupling should be considered.","abstract_html":"With discovery of novel superconductivity in Sr2RuO4 and the exciting theoretical results regarding strong spin-orbit couple regime, iridate compounds have come to a focus in many experimental and theoretical studies. Especially, Sr2IrO4 has come to special interest due to 3-d parent compoun La2CuO4. Understanding the similarity and difference in the two compounds are crucial toward search for novel superconductivity in Sr2IrO4 compounds. In this thesis we present inelastic scattering study of the Sr2IrO4 under high magentic field, high presure and temperature. The magnetic field study showed disticntively two different regimes as a function of applied in-plane external field. For moderately high magnetic fiels, H&gt;1.5 T, Sr2IrO4 magnetic mode shows behavior consistent with S=1/2 2D Heisenberg model. However, for H&lt;1.5 T, it shows anisotropic behavior as a function of external field due to interlayer couling. Ths study showed that while for even for moderate field, the magentic behavior is consistent with suggested two-dimensional effective S=1/2 Hamiltonian, for in low fields it showed anisotropic behavior. For future studies, the important role of the interlayer coupling should be considered.","abstract_has_math":false,"creators":["Gim, Yewon"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Cooper, Lance","MacDougall, Greg","Vishveshwara, Smitha","Lorenz, Virginia"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2018,"date_issued":"2018-09-27T16:17:19Z","date_published":"2018-09-27T16:17:19Z","updated_at":"2026-07-22T22:24:40Z","subjects":["iridate","raman scattering","strong spin-orbit coupling"],"languages":["en"],"rights":["Copyright 2018 Yewon Gim"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/101467","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Cooper, Lance","MacDougall, Greg","Vishveshwara, Smitha","Lorenz, Virginia"]},{"key":"dc:creator","label":"Author","values":["Gim, Yewon"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2018-09-27T16:17:19Z","2018-05-21","2018-08"]},{"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":["iridate","raman scattering","strong spin-orbit coupling"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2018 Yewon Gim"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/101467"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["With discovery of novel superconductivity in Sr2RuO4 and the exciting theoretical results regarding strong spin-orbit couple regime, iridate compounds have come to a focus in many experimental and theoretical studies. Especially, Sr2IrO4 has come to special interest due to 3-d parent compoun La2CuO4. Understanding the similarity and difference in the two compounds are crucial toward search for novel superconductivity in Sr2IrO4 compounds. In this thesis we present inelastic scattering study of the Sr2IrO4 under high magentic field, high presure and temperature. The magnetic field study showed disticntively two different regimes as a function of applied in-plane external field. For moderately high magnetic fiels, H>1.5 T, Sr2IrO4 magnetic mode shows behavior consistent with S=1/2 2D Heisenberg model. However, for H<1.5 T, it shows anisotropic behavior as a function of external field due to interlayer couling. Ths study showed that while for even for moderate field, the magentic behavior is consistent with suggested two-dimensional effective S=1/2 Hamiltonian, for in low fields it showed anisotropic behavior. For future studies, the important role of the interlayer coupling should be considered.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2018-09-27 without embargo terms","The student, Yewon Gim, accepted the attached license on 2018-05-16 at 18:21.","The student, Yewon Gim, submitted this Dissertation for approval on 2018-05-16 at 18:28.","This Dissertation was approved for publication on 2018-05-21 at 13:47.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12578 on 2018-09-27 at 10:44:05","Made available in DSpace on 2018-09-27T16:17:19Z (GMT). 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Especially, Sr2IrO4 has come to special interest due to 3-d parent compoun La2CuO4. Understanding the similarity and difference in the two compounds are crucial toward search for novel superconductivity in Sr2IrO4 compounds. In this thesis we present inelastic scattering study of the Sr2IrO4 under high magentic field, high presure and temperature. The magnetic field study showed disticntively two different regimes as a function of applied in-plane external field. For moderately high magnetic fiels, H>1.5 T, Sr2IrO4 magnetic mode shows behavior consistent with S=1/2 2D Heisenberg model. However, for H<1.5 T, it shows anisotropic behavior as a function of external field due to interlayer couling. Ths study showed that while for even for moderate field, the magentic behavior is consistent with suggested two-dimensional effective S=1/2 Hamiltonian, for in low fields it showed anisotropic behavior. For future studies, the important role of the interlayer coupling should be considered.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2018-09-27 without embargo terms","The student, Yewon Gim, accepted the attached license on 2018-05-16 at 18:21.","The student, Yewon Gim, submitted this Dissertation for approval on 2018-05-16 at 18:28.","This Dissertation was approved for publication on 2018-05-21 at 13:47.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12578 on 2018-09-27 at 10:44:05","Made available in DSpace on 2018-09-27T16:17:19Z (GMT). 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