{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/21413"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/21413","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Irreversibility line, Hall effect, and longitudinal resistivity measurements on cobalt-doped yttrium barium(2) copper(3) oxygen(7-delta)","abstract":"We have developed a procedure for growing high-quality single crystals of YBa$\\sb2$(Cu$\\sb{\\rm 1-x}$Co$\\sb{\\rm x})\\sb3$O$\\sb{7-\\delta}.$ By high-pressure oxygen annealing, we produced single crystals having transition temperatures, T$\\sb{\\rm c}$, comparable with those of polycrystalline samples of the same cobalt concentration.","abstract_html":"We have developed a procedure for growing high-quality single crystals of YBa$\\sb2$(Cu$\\sb{\\rm 1-x}$Co$\\sb{\\rm x})\\sb3$O<span class=\"etd-inline-math\">\\sb{7-&delta;}.</span> By high-pressure oxygen annealing, we produced single crystals having transition temperatures, T$\\sb{\\rm c}$, comparable with those of polycrystalline samples of the same cobalt concentration.","abstract_has_math":true,"creators":["Neiman, Regina Lynn"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Ginsberg, Donald M."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:07:56Z","date_published":"2011-05-07T13:07:56Z","updated_at":"2026-07-22T22:25:17Z","subjects":["Physics, Condensed Matter"],"languages":["eng"],"rights":["Copyright 1995 Neiman, Regina Lynn"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9543683","(UMI)AAI9543683"],"render_values":[{"text":"AAI9543683","href":null,"code":true},{"text":"(UMI)AAI9543683","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/21413","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Ginsberg, Donald M."]},{"key":"dc:creator","label":"Author","values":["Neiman, Regina Lynn"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T13:07:56Z","10000-01-01","1995"]},{"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"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1995 Neiman, Regina Lynn"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9543683","(UMI)AAI9543683","http://hdl.handle.net/2142/21413"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["We have developed a procedure for growing high-quality single crystals of YBa$\\sb2$(Cu$\\sb{\\rm 1-x}$Co$\\sb{\\rm x})\\sb3$O$\\sb{7-\\delta}.$ By high-pressure oxygen annealing, we produced single crystals having transition temperatures, T$\\sb{\\rm c}$, comparable with those of polycrystalline samples of the same cobalt concentration.","We have investigated the effect of cobalt on T$\\sb{\\rm c}$ and the DC irreversibility line. As seen previously, we found that the dependence of T$\\sb{\\rm c}$ on the concentration of cobalt changes at the orthorhombic-to-tetragonal phase transition. We also found that the DC irreversibility line changes functional form at approximately 2.5% to 3% cobalt substitution, where the orthorhombic-to-tetragonal phase transition occurs.","We have measured the in-plane Hall effect and the in-plane resistivity of cobalt-doped YBa$\\sb2$Cu$\\sb3$O$\\sb{7-\\delta}$ single-crystal samples. The sign-reversal in the Hall effect below T$\\sb{\\rm c}$ disappears at approximately the orthorhombic-to-tetragonal phase transition. The resistivities were converted into conductivities to investigate the field dependence of the Hall effect. The Hall conductivity, $\\sigma\\sb{\\rm xy},$ is the sum of two terms, C$\\sb1$/H and C$\\sb2$H, where C$\\sb1$ and C$\\sb2$ are field-independent but temperature-dependent. The temperature dependences of C$\\sb1$ and C$\\sb2$ were qualitatively unaffected by cobalt-doping.","From our measurements, it appears that the orthorhombic-to-tetragonal phase transition is important in the behavior of cobalt-doped Y?BCO samples. In order to explain the effect of cobalt on YBCO, it seems that more emphasis should be put on understanding what happens when the sample changes phase from orthorhombic to tetragonal.","Made available in DSpace on 2011-05-07T13:07:56Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9543683.pdf: 4610665 bytes, checksum: d590d4d9d9258996d6342136ae039f45 (MD5) Previous issue date: 1995","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:50:36Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:23:08-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Irreversibility line, Hall effect, and longitudinal resistivity measurements on cobalt-doped yttrium barium(2) copper(3) oxygen(7-delta)"]}]}],"canonical_facts":{"dc:contributor":["Ginsberg, Donald M."],"dc:creator":["Neiman, Regina Lynn"],"dc:date":["2011-05-07T13:07:56Z","10000-01-01","1995"],"dc:description":["We have developed a procedure for growing high-quality single crystals of YBa$\\sb2$(Cu$\\sb{\\rm 1-x}$Co$\\sb{\\rm x})\\sb3$O$\\sb{7-\\delta}.$ By high-pressure oxygen annealing, we produced single crystals having transition temperatures, T$\\sb{\\rm c}$, comparable with those of polycrystalline samples of the same cobalt concentration.","We have investigated the effect of cobalt on T$\\sb{\\rm c}$ and the DC irreversibility line. As seen previously, we found that the dependence of T$\\sb{\\rm c}$ on the concentration of cobalt changes at the orthorhombic-to-tetragonal phase transition. We also found that the DC irreversibility line changes functional form at approximately 2.5% to 3% cobalt substitution, where the orthorhombic-to-tetragonal phase transition occurs.","We have measured the in-plane Hall effect and the in-plane resistivity of cobalt-doped YBa$\\sb2$Cu$\\sb3$O$\\sb{7-\\delta}$ single-crystal samples. The sign-reversal in the Hall effect below T$\\sb{\\rm c}$ disappears at approximately the orthorhombic-to-tetragonal phase transition. The resistivities were converted into conductivities to investigate the field dependence of the Hall effect. The Hall conductivity, $\\sigma\\sb{\\rm xy},$ is the sum of two terms, C$\\sb1$/H and C$\\sb2$H, where C$\\sb1$ and C$\\sb2$ are field-independent but temperature-dependent. The temperature dependences of C$\\sb1$ and C$\\sb2$ were qualitatively unaffected by cobalt-doping.","From our measurements, it appears that the orthorhombic-to-tetragonal phase transition is important in the behavior of cobalt-doped Y?BCO samples. In order to explain the effect of cobalt on YBCO, it seems that more emphasis should be put on understanding what happens when the sample changes phase from orthorhombic to tetragonal.","Made available in DSpace on 2011-05-07T13:07:56Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9543683.pdf: 4610665 bytes, checksum: d590d4d9d9258996d6342136ae039f45 (MD5) Previous issue date: 1995","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:50:36Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:23:08-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI9543683","(UMI)AAI9543683","http://hdl.handle.net/2142/21413"],"dc:language":["eng"],"dc:rights":["Copyright 1995 Neiman, Regina Lynn"],"dc:subject":["Physics, Condensed Matter"],"dc:title":["Irreversibility line, Hall effect, and longitudinal resistivity measurements on cobalt-doped yttrium barium(2) copper(3) oxygen(7-delta)"],"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":"2026-07-22T22:25:17Z"}