{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/102421"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/102421","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"A powder neutron scattering study of magnetism in potassium copper trifluoride as a function of hydrostatic pressure","abstract":"Presented here are elastic neutron scattering pressure studies investigating the magnetic ordering of KCuF3 under hydrostatic pressure. Recent studies have predicted the magnetic ordering to be modified at P ~ 7 kbar due to a glassy structural transition. Single crystal studies by Alexander Thaler of the MacDougall lab indicated relative peak intensities of the (001) and (003) magnetic Bragg peaks were not suppressed with pressure. Interestingly, the suppression of the (201) magnetic Bragg peak was observed. These results are believed to be due to a spin reorientation caused by a uniaxial strain component caused by using a clamp cell. Single crystal measurements also identified that the Néel temperature increased by approximately 1.6 K with 1.07 GPa applied pressure. We were motivated to further investigate the magnetic ordering of KCuF3 in a manner which mitigates the effect of the uniaxial strain on the magnetic properties of the material. Therefore, powder measurements were performed in various cell types. My work found that the ordered moment in powder samples under pressure does not appear to significantly change the magnetic ordering in this material up to P ~ 8 kbar, suggesting that the prediction of modified magnetic ordering due to a glassy structural transition does not occur.","abstract_html":"Presented here are elastic neutron scattering pressure studies investigating the magnetic ordering of KCuF3 under hydrostatic pressure. Recent studies have predicted the magnetic ordering to be modified at P ~ 7 kbar due to a glassy structural transition. Single crystal studies by Alexander Thaler of the MacDougall lab indicated relative peak intensities of the (001) and (003) magnetic Bragg peaks were not suppressed with pressure. Interestingly, the suppression of the (201) magnetic Bragg peak was observed. These results are believed to be due to a spin reorientation caused by a uniaxial strain component caused by using a clamp cell. Single crystal measurements also identified that the Néel temperature increased by approximately 1.6 K with 1.07 GPa applied pressure. We were motivated to further investigate the magnetic ordering of KCuF3 in a manner which mitigates the effect of the uniaxial strain on the magnetic properties of the material. Therefore, powder measurements were performed in various cell types. My work found that the ordered moment in powder samples under pressure does not appear to significantly change the magnetic ordering in this material up to P ~ 8 kbar, suggesting that the prediction of modified magnetic ordering due to a glassy structural transition does not occur.","abstract_has_math":false,"creators":["Nguyen, Brian Tuan-anh"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Chemistry","degree_department":null,"school":null,"contributors":["MacDougall, Gregory J.","Gruebele, Martin"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-02-06T19:32:48Z","date_published":"2019-02-06T19:32:48Z","updated_at":"2026-07-22T22:24:40Z","subjects":["neutron scattering","magnetism","powder","pressure","kcuf3"],"languages":["en"],"rights":["Copyright 2018 Brian Nguyen"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/102421","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["MacDougall, Gregory J.","Gruebele, Martin"]},{"key":"dc:creator","label":"Author","values":["Nguyen, Brian Tuan-anh"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-02-06T19:32:48Z","2018-11-08","2018-12"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemistry"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"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":["neutron scattering","magnetism","powder","pressure","kcuf3"]}]},{"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 Brian Nguyen"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/102421"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Presented here are elastic neutron scattering pressure studies investigating the magnetic ordering of KCuF3 under hydrostatic pressure. Recent studies have predicted the magnetic ordering to be modified at P ~ 7 kbar due to a glassy structural transition. Single crystal studies by Alexander Thaler of the MacDougall lab indicated relative peak intensities of the (001) and (003) magnetic Bragg peaks were not suppressed with pressure. Interestingly, the suppression of the (201) magnetic Bragg peak was observed. These results are believed to be due to a spin reorientation caused by a uniaxial strain component caused by using a clamp cell. Single crystal measurements also identified that the Néel temperature increased by approximately 1.6 K with 1.07 GPa applied pressure. We were motivated to further investigate the magnetic ordering of KCuF3 in a manner which mitigates the effect of the uniaxial strain on the magnetic properties of the material. Therefore, powder measurements were performed in various cell types. My work found that the ordered moment in powder samples under pressure does not appear to significantly change the magnetic ordering in this material up to P ~ 8 kbar, suggesting that the prediction of modified magnetic ordering due to a glassy structural transition does not occur.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2019-02-05 without embargo terms","The student, Brian Nguyen, accepted the attached license on 2018-11-03 at 14:04.","The student, Brian Nguyen, submitted this Thesis for approval on 2018-11-03 at 14:05.","This Thesis was approved for publication on 2018-11-08 at 09:11.","DSpace SAF Submission Ingestion Package generated from Vireo submission #13056 on 2019-02-05 at 11:08:46","Made available in DSpace on 2019-02-06T19:32:48Z (GMT). No. of bitstreams: 2 NGUYEN-THESIS-2018.pdf: 1142471 bytes, checksum: de02f5de32c3098746f63c316987837a (MD5) LICENSE.txt: 4209 bytes, checksum: 178e2092a969b47dbcbec6f9faf3aaba (MD5) Previous issue date: 2018-11-08"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["A powder neutron scattering study of magnetism in potassium copper trifluoride as a function of hydrostatic pressure"]}]}],"canonical_facts":{"dc:contributor":["MacDougall, Gregory J.","Gruebele, Martin"],"dc:creator":["Nguyen, Brian Tuan-anh"],"dc:date":["2019-02-06T19:32:48Z","2018-11-08","2018-12"],"dc:description":["Presented here are elastic neutron scattering pressure studies investigating the magnetic ordering of KCuF3 under hydrostatic pressure. Recent studies have predicted the magnetic ordering to be modified at P ~ 7 kbar due to a glassy structural transition. Single crystal studies by Alexander Thaler of the MacDougall lab indicated relative peak intensities of the (001) and (003) magnetic Bragg peaks were not suppressed with pressure. Interestingly, the suppression of the (201) magnetic Bragg peak was observed. These results are believed to be due to a spin reorientation caused by a uniaxial strain component caused by using a clamp cell. Single crystal measurements also identified that the Néel temperature increased by approximately 1.6 K with 1.07 GPa applied pressure. We were motivated to further investigate the magnetic ordering of KCuF3 in a manner which mitigates the effect of the uniaxial strain on the magnetic properties of the material. Therefore, powder measurements were performed in various cell types. My work found that the ordered moment in powder samples under pressure does not appear to significantly change the magnetic ordering in this material up to P ~ 8 kbar, suggesting that the prediction of modified magnetic ordering due to a glassy structural transition does not occur.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2019-02-05 without embargo terms","The student, Brian Nguyen, accepted the attached license on 2018-11-03 at 14:04.","The student, Brian Nguyen, submitted this Thesis for approval on 2018-11-03 at 14:05.","This Thesis was approved for publication on 2018-11-08 at 09:11.","DSpace SAF Submission Ingestion Package generated from Vireo submission #13056 on 2019-02-05 at 11:08:46","Made available in DSpace on 2019-02-06T19:32:48Z (GMT). No. of bitstreams: 2 NGUYEN-THESIS-2018.pdf: 1142471 bytes, checksum: de02f5de32c3098746f63c316987837a (MD5) LICENSE.txt: 4209 bytes, checksum: 178e2092a969b47dbcbec6f9faf3aaba (MD5) Previous issue date: 2018-11-08"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/102421"],"dc:language":["en"],"dc:rights":["Copyright 2018 Brian Nguyen"],"dc:subject":["neutron scattering","magnetism","powder","pressure","kcuf3"],"dc:title":["A powder neutron scattering study of magnetism in potassium copper trifluoride as a function of hydrostatic pressure"],"dc:type":["text"],"thesis:degree_discipline":["Chemistry"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:40Z"}