{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/23245"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/23245","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Growth, fabrication, and measurement of superconducting barium(1-x) potassium bismuth oxygen(3) thin films and devices","abstract":"This thesis discusses growth, fabrication and measurement of $\\rm Ba\\sb{1-x}K\\sb{x}BiO\\sb3$ (BKBO) superconducting thin films and thin film devices. Interest in BKBO has been concerned with both fundamental questions concerning its mechanism of superconductivity and potential applications in superconductor devices. $\\rm Ba\\sb{1-x}K\\sb{x}BiO\\sb3$ is a superconducting compound at a small range of potassium concentration, with the highest transition temperature being about $32\\sp\\circ\\rm K$ for 0.35 $<$ x $<$ 0.4 The in-situ growth of high quality superconducting thin films is described, using pulsed laser deposition. Film quality was analyzed with RBS, XRD, and SEM as well as transport. Fabrication of transport, microwave, and tunneling structures and devices is described, including dry etching techniques (ion milling and RIBM) as well as annealing and processing effects. Transport measurements yield $\\rm T\\sb{c0}$ = 25-29$\\sp\\circ\\rm K,$ $\\rm J\\sb{c}$ $\\ge$ 1 $\\rm MA/cm\\sp2$ $(4\\sp\\circ\\rm K),$ and $\\rm R\\sb{s}$ $\\approx$ 1 $\\rm m\\Omega$ (at $4\\sp\\circ\\rm K$ and 10GHz) for the best films. Dissipation in fields up to 5 Tesla suggests that the superconducting coherence length $\\xi\\approx 38\\rm\\A$ and upper critical field $\\rm H\\sb{c2}(0)\\approx$ 22T. Tunneling studies were also made using a BKBO electrode, a native oxide barrier, and the following counterelectrodes: Ag, Pb, Nb, and BKBO. Results were consistent with classical tunneling of a weak to moderately coupled superconductor where $\\Delta$ = 4.5 meV and $2\\Delta\\rm /k\\sb{B}T\\sb{c}$ = 3.8. Prospects for practical BKBO superconducting devices are discussed.","abstract_html":"This thesis discusses growth, fabrication and measurement of $\\rm Ba\\sb{1-x}K\\sb{x}BiO\\sb3$ (BKBO) superconducting thin films and thin film devices. Interest in BKBO has been concerned with both fundamental questions concerning its mechanism of superconductivity and potential applications in superconductor devices. $\\rm Ba\\sb{1-x}K\\sb{x}BiO\\sb3$ is a superconducting compound at a small range of potassium concentration, with the highest transition temperature being about $32\\sp\\circ\\rm K$ for 0.35 $&lt;$ x $&lt;$ 0.4 The in-situ growth of high quality superconducting thin films is described, using pulsed laser deposition. Film quality was analyzed with RBS, XRD, and SEM as well as transport. Fabrication of transport, microwave, and tunneling structures and devices is described, including dry etching techniques (ion milling and RIBM) as well as annealing and processing effects. Transport measurements yield $\\rm T\\sb{c0}$ = 25-29$\\sp\\circ\\rm K,$ $\\rm J\\sb{c}$ $\\ge$ 1 $\\rm MA/cm\\sp2$ $(4\\sp\\circ\\rm K),$ and $\\rm R\\sb{s}$ $\\approx$ 1 $\\rm m\\Omega$ (at $4\\sp\\circ\\rm K$ and 10GHz) for the best films. Dissipation in fields up to 5 Tesla suggests that the superconducting coherence length $\\xi\\approx 38\\rm\\A$ and upper critical field $\\rm H\\sb{c2}(0)\\approx$ 22T. Tunneling studies were also made using a BKBO electrode, a native oxide barrier, and the following counterelectrodes: Ag, Pb, Nb, and BKBO. Results were consistent with classical tunneling of a weak to moderately coupled superconductor where $\\Delta$ = 4.5 meV and $2\\Delta\\rm /k\\sb{B}T\\sb{c}$ = 3.8. Prospects for practical BKBO superconducting devices are discussed.","abstract_has_math":true,"creators":["Schweinfurth, Ralph Alan"],"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."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T14:07:19Z","date_published":"2011-05-07T14:07:19Z","updated_at":"2026-07-22T22:25:21Z","subjects":["Engineering, Electronics and Electrical","Physics, Condensed Matter","Engineering, Materials Science"],"languages":["eng"],"rights":["Copyright 1994 Schweinfurth, Ralph Alan"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9503312","(UMI)AAI9503312"],"render_values":[{"text":"AAI9503312","href":null,"code":true},{"text":"(UMI)AAI9503312","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/23245","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Van Harlingen, Dale J."]},{"key":"dc:creator","label":"Author","values":["Schweinfurth, Ralph Alan"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T14:07:19Z","10000-01-01","1994"]},{"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":["Engineering, Electronics and Electrical","Physics, Condensed Matter","Engineering, Materials Science"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1994 Schweinfurth, Ralph Alan"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9503312","(UMI)AAI9503312","http://hdl.handle.net/2142/23245"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This thesis discusses growth, fabrication and measurement of $\\rm Ba\\sb{1-x}K\\sb{x}BiO\\sb3$ (BKBO) superconducting thin films and thin film devices. Interest in BKBO has been concerned with both fundamental questions concerning its mechanism of superconductivity and potential applications in superconductor devices. $\\rm Ba\\sb{1-x}K\\sb{x}BiO\\sb3$ is a superconducting compound at a small range of potassium concentration, with the highest transition temperature being about $32\\sp\\circ\\rm K$ for 0.35 $<$ x $<$ 0.4 The in-situ growth of high quality superconducting thin films is described, using pulsed laser deposition. Film quality was analyzed with RBS, XRD, and SEM as well as transport. Fabrication of transport, microwave, and tunneling structures and devices is described, including dry etching techniques (ion milling and RIBM) as well as annealing and processing effects. Transport measurements yield $\\rm T\\sb{c0}$ = 25-29$\\sp\\circ\\rm K,$ $\\rm J\\sb{c}$ $\\ge$ 1 $\\rm MA/cm\\sp2$ $(4\\sp\\circ\\rm K),$ and $\\rm R\\sb{s}$ $\\approx$ 1 $\\rm m\\Omega$ (at $4\\sp\\circ\\rm K$ and 10GHz) for the best films. Dissipation in fields up to 5 Tesla suggests that the superconducting coherence length $\\xi\\approx 38\\rm\\A$ and upper critical field $\\rm H\\sb{c2}(0)\\approx$ 22T. Tunneling studies were also made using a BKBO electrode, a native oxide barrier, and the following counterelectrodes: Ag, Pb, Nb, and BKBO. Results were consistent with classical tunneling of a weak to moderately coupled superconductor where $\\Delta$ = 4.5 meV and $2\\Delta\\rm /k\\sb{B}T\\sb{c}$ = 3.8. Prospects for practical BKBO superconducting devices are discussed.","Made available in DSpace on 2011-05-07T14:07:19Z (GMT). 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Interest in BKBO has been concerned with both fundamental questions concerning its mechanism of superconductivity and potential applications in superconductor devices. $\\rm Ba\\sb{1-x}K\\sb{x}BiO\\sb3$ is a superconducting compound at a small range of potassium concentration, with the highest transition temperature being about $32\\sp\\circ\\rm K$ for 0.35 $<$ x $<$ 0.4 The in-situ growth of high quality superconducting thin films is described, using pulsed laser deposition. Film quality was analyzed with RBS, XRD, and SEM as well as transport. Fabrication of transport, microwave, and tunneling structures and devices is described, including dry etching techniques (ion milling and RIBM) as well as annealing and processing effects. Transport measurements yield $\\rm T\\sb{c0}$ = 25-29$\\sp\\circ\\rm K,$ $\\rm J\\sb{c}$ $\\ge$ 1 $\\rm MA/cm\\sp2$ $(4\\sp\\circ\\rm K),$ and $\\rm R\\sb{s}$ $\\approx$ 1 $\\rm m\\Omega$ (at $4\\sp\\circ\\rm K$ and 10GHz) for the best films. Dissipation in fields up to 5 Tesla suggests that the superconducting coherence length $\\xi\\approx 38\\rm\\A$ and upper critical field $\\rm H\\sb{c2}(0)\\approx$ 22T. Tunneling studies were also made using a BKBO electrode, a native oxide barrier, and the following counterelectrodes: Ag, Pb, Nb, and BKBO. Results were consistent with classical tunneling of a weak to moderately coupled superconductor where $\\Delta$ = 4.5 meV and $2\\Delta\\rm /k\\sb{B}T\\sb{c}$ = 3.8. Prospects for practical BKBO superconducting devices are discussed.","Made available in DSpace on 2011-05-07T14:07:19Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9503312.pdf: 4523009 bytes, checksum: 7023de496f5c237d9d273131340166c1 (MD5) Previous issue date: 1994","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:03:10Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:30:06-05:00 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":["AAI9503312","(UMI)AAI9503312","http://hdl.handle.net/2142/23245"],"dc:language":["eng"],"dc:rights":["Copyright 1994 Schweinfurth, Ralph Alan"],"dc:subject":["Engineering, Electronics and Electrical","Physics, Condensed Matter","Engineering, Materials Science"],"dc:title":["Growth, fabrication, and measurement of superconducting barium(1-x) potassium bismuth oxygen(3) thin films and devices"],"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":"2026-07-22T22:25:21Z"}