{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/78286"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/78286","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Probing the superconducting order parameter of Iron-based superconductors through the Josephson effect","abstract":"We report the results we obtained regarding the use of the Josephson effect to probe the symmetry of the superconducting order parameter of Co-doped Ba(FeAs)2 crystals (Ba122). This measurements were carried out to test the validity of the s± model, which predicts the pairing in the multiband Ba122 compounds being mediated by the exchange of spin excitations, with the condition that the electron and hole bands in the superconductor's Fermi surface have opposite signs. Josephson interferometry applied using Pb/Cu/Ba122 SNS structures in corner/edge junction configurations shows two distinct Ic patterns that support an anisotropic s-wave superconducting gap. The use of IcRN data favors the hypothesis of the gap anisotropy being in direct connection to an electron gap having an opposite sign when compared to the hole gaps in the material. Finally we considered the prediction of proximity-induced changes in the density of states of a thin film of a conventional superconductor due to the presence of a Ba122 crystal. Our results found evidence of both a positive and a negative proximity effect, which in conjunction with other features identified in the density of states spectrum of the thin film of conventional superconductor, points strongly towards the legitimacy of s± model.","abstract_html":"We report the results we obtained regarding the use of the Josephson effect to probe the symmetry of the superconducting order parameter of Co-doped Ba(FeAs)2 crystals (Ba122). This measurements were carried out to test the validity of the s± model, which predicts the pairing in the multiband Ba122 compounds being mediated by the exchange of spin excitations, with the condition that the electron and hole bands in the superconductor's Fermi surface have opposite signs. Josephson interferometry applied using Pb/Cu/Ba122 SNS structures in corner/edge junction configurations shows two distinct Ic patterns that support an anisotropic s-wave superconducting gap. The use of IcRN data favors the hypothesis of the gap anisotropy being in direct connection to an electron gap having an opposite sign when compared to the hole gaps in the material. Finally we considered the prediction of proximity-induced changes in the density of states of a thin film of a conventional superconductor due to the presence of a Ba122 crystal. Our results found evidence of both a positive and a negative proximity effect, which in conjunction with other features identified in the density of states spectrum of the thin film of conventional superconductor, points strongly towards the legitimacy of s± model.","abstract_has_math":false,"creators":["Atkinson Mora, Juan"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Van Harlingen, Dale J.","Giannetta, Russell W.","Phillips, Philip W.","Pitts, Kevin T."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-07-22T22:15:28Z","date_published":"2015-07-22T22:15:28Z","updated_at":"2026-07-22T22:26:11Z","subjects":["proximity effect","Josephson","pairing symmetry","Ba122","Fe-based superconductor","Superconductor"],"languages":[],"rights":["Copyright 2015 Juan Miguel Atkinson Mora"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/78286","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Van Harlingen, Dale J.","Giannetta, Russell W.","Phillips, Philip W.","Pitts, Kevin T."]},{"key":"dc:creator","label":"Author","values":["Atkinson Mora, Juan"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-07-22T22:15:28Z","2015-05","2014-12-17","2015-5"]},{"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":["proximity effect","Josephson","pairing symmetry","Ba122","Fe-based superconductor","Superconductor"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2015 Juan Miguel Atkinson Mora"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/78286"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["We report the results we obtained regarding the use of the Josephson effect to probe the symmetry of the superconducting order parameter of Co-doped Ba(FeAs)2 crystals (Ba122). This measurements were carried out to test the validity of the s± model, which predicts the pairing in the multiband Ba122 compounds being mediated by the exchange of spin excitations, with the condition that the electron and hole bands in the superconductor's Fermi surface have opposite signs. Josephson interferometry applied using Pb/Cu/Ba122 SNS structures in corner/edge junction configurations shows two distinct Ic patterns that support an anisotropic s-wave superconducting gap. The use of IcRN data favors the hypothesis of the gap anisotropy being in direct connection to an electron gap having an opposite sign when compared to the hole gaps in the material. Finally we considered the prediction of proximity-induced changes in the density of states of a thin film of a conventional superconductor due to the presence of a Ba122 crystal. Our results found evidence of both a positive and a negative proximity effect, which in conjunction with other features identified in the density of states spectrum of the thin film of conventional superconductor, points strongly towards the legitimacy of s± model.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2015-07-22 without embargo terms","The student, Juan Atkinson Mora, accepted the attached license on 2014-12-16 at 14:39.","The student, Juan Atkinson Mora, submitted this Dissertation for approval on 2014-12-16 at 15:10.","This Dissertation was approved for publication on 2014-12-17 at 14:23.","DSpace SAF Submission Ingestion Package generated from Vireo submission #7666 on 2015-07-22 at 10:29:25","Made available in DSpace on 2015-07-22T22:15:28Z (GMT). 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This measurements were carried out to test the validity of the s± model, which predicts the pairing in the multiband Ba122 compounds being mediated by the exchange of spin excitations, with the condition that the electron and hole bands in the superconductor's Fermi surface have opposite signs. Josephson interferometry applied using Pb/Cu/Ba122 SNS structures in corner/edge junction configurations shows two distinct Ic patterns that support an anisotropic s-wave superconducting gap. The use of IcRN data favors the hypothesis of the gap anisotropy being in direct connection to an electron gap having an opposite sign when compared to the hole gaps in the material. Finally we considered the prediction of proximity-induced changes in the density of states of a thin film of a conventional superconductor due to the presence of a Ba122 crystal. Our results found evidence of both a positive and a negative proximity effect, which in conjunction with other features identified in the density of states spectrum of the thin film of conventional superconductor, points strongly towards the legitimacy of s± model.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2015-07-22 without embargo terms","The student, Juan Atkinson Mora, accepted the attached license on 2014-12-16 at 14:39.","The student, Juan Atkinson Mora, submitted this Dissertation for approval on 2014-12-16 at 15:10.","This Dissertation was approved for publication on 2014-12-17 at 14:23.","DSpace SAF Submission Ingestion Package generated from Vireo submission #7666 on 2015-07-22 at 10:29:25","Made available in DSpace on 2015-07-22T22:15:28Z (GMT). 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