{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/18616"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/18616","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Superconducting Transition-Edge Sensor Physics","abstract":"Despite record-setting performance demonstrated by superconducting Transition Edge Sensors (TESs) and growing utilization of the technology, a theoretical model of the physics governing TES devices superconducting phase transition has proven elusive. Earlier attempts to describe TESs assumed them to be uniform superconductors. Sadleir et al. 2010 shows that TESs are weak links and that the superconducting order parameter strength has significant spatial variation. Measurements are presented of the temperature T and magnetic field B dependence of the critical current Ic measured over 7 orders of magnitude on square Mo/Au bilayers ranging in length from 8 to 290 microns. We find our measurements have a natural explanation in terms of a spatially varying order parameter that is enhanced in proximity to the higher transition temperature superconducting leads (the longitudinal proximity effect) and suppressed in proximity to the added normal metal structures (the lateral inverse proximity effect). These in-plane proximity effects and scaling relations are observed over unprecedentedly long lengths (in excess of 1000 times the mean free path) and explained in terms of a Ginzburg-Landau model. Our low temperature Ic(B) measurements are found to agree with a general derivation of a superconducting strip with an edge or geometric barrier to vortex entry and we also derive two conditions that lead to Ic rectification. At high temperatures the Ic(B) exhibits distinct Josephson effect behavior over long length scales and following functional dependences not previously reported. We also investigate how film stress changes the transition, explain some transition features in terms of a nonequilibrium superconductivity effect, and show that our measurements of the resistive transition are not consistent with a percolating resistor network model.","abstract_html":"Despite record-setting performance demonstrated by superconducting Transition Edge Sensors (TESs) and growing utilization of the technology, a theoretical model of the physics governing TES devices superconducting phase transition has proven elusive. Earlier attempts to describe TESs assumed them to be uniform superconductors. Sadleir et al. 2010 shows that TESs are weak links and that the superconducting order parameter strength has significant spatial variation. Measurements are presented of the temperature T and magnetic field B dependence of the critical current Ic measured over 7 orders of magnitude on square Mo/Au bilayers ranging in length from 8 to 290 microns. We find our measurements have a natural explanation in terms of a spatially varying order parameter that is enhanced in proximity to the higher transition temperature superconducting leads (the longitudinal proximity effect) and suppressed in proximity to the added normal metal structures (the lateral inverse proximity effect). These in-plane proximity effects and scaling relations are observed over unprecedentedly long lengths (in excess of 1000 times the mean free path) and explained in terms of a Ginzburg-Landau model. Our low temperature Ic(B) measurements are found to agree with a general derivation of a superconducting strip with an edge or geometric barrier to vortex entry and we also derive two conditions that lead to Ic rectification. At high temperatures the Ic(B) exhibits distinct Josephson effect behavior over long length scales and following functional dependences not previously reported. We also investigate how film stress changes the transition, explain some transition features in terms of a nonequilibrium superconductivity effect, and show that our measurements of the resistive transition are not consistent with a percolating resistor network model.","abstract_has_math":false,"creators":["Sadleir, John E."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Robinson, Ian K.","Chiang, Tai-Chang","Errede, Steven M.","Selvin, Paul R."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-01-21T22:51:46Z","date_published":"2011-01-21T22:51:46Z","updated_at":"2026-07-22T22:25:11Z","subjects":["Josephson Effect","Fraunhofer pattern","Fraunhofer interference pattern","Fraunhofer diffraction pattern","superconducting molybdenum thin films","paraconductivity","Josephson weak-link","superconducting normal metal bilayers","SN trilayers","Superconductivity","Superconductors","proximity effect","inverse proximity effect","superconducting weak-link","SNS","NSN","SNS weak links","SN'S weak links","SS'S","SN heterostructures","superconducting normal-metal heterostructures","critical current effects","rectification","critical current asymmetry","Ic asymmetry","edge-barrier critical current","geometric barrier critical current","stress effects in superconducting thin films","Transition Edge Sensors(TES)","superconducting transition edge sensors","superconducting transition edge sensors(TES)","Superconducting phase thermometers","Percolation theory","random superconducting resistor network","nonequilibrium superconductivity","Longitudinal proximity effect","lateral inverse proximity effect","x-ray detectors","microcalorimeters","quantum calorimeters","quantum microcalorimeters","bolometers","microwave bolometers","infra-red bolometers","superconducting transition","superconducting phase transition","superconducting phase transition width","transition width","superconducting resistive transition","resistive transition width","excess current effects","R(I,T) surface","R(I,T,B) surface","magnetic flux quantization","exponential critical current","superconducting critical length","spatially varying superconducting order parameter","spatial variation of the superconducting order parameter","superconducting transition temperature","critical current evolution","Josephson critical current","nonuniform superconductivity","longitudinal proximity e ect (LoPE)","lateral inverse proximity e ffect (LaiPE)","Self-fielding effects","flux focusing"],"languages":["en"],"rights":["Copyright 2010 John E. Sadleir"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/18616","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Robinson, Ian K.","Chiang, Tai-Chang","Errede, Steven M.","Selvin, Paul R."]},{"key":"dc:creator","label":"Author","values":["Sadleir, John E."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-01-21T22:51:46Z","2013-01-22T11:00:16Z","2010-12"]},{"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":["Josephson Effect","Fraunhofer pattern","Fraunhofer interference pattern","Fraunhofer diffraction pattern","superconducting molybdenum thin films","paraconductivity","Josephson weak-link","superconducting normal metal bilayers","SN trilayers","Superconductivity","Superconductors","proximity effect","inverse proximity effect","superconducting weak-link","SNS","NSN","SNS weak links","SN'S weak links","SS'S","SN heterostructures","superconducting normal-metal heterostructures","critical current effects","rectification","critical current asymmetry","Ic asymmetry","edge-barrier critical current","geometric barrier critical current","stress effects in superconducting thin films","Transition Edge Sensors(TES)","superconducting transition edge sensors","superconducting transition edge sensors(TES)","Superconducting phase thermometers","Percolation theory","random superconducting resistor network","nonequilibrium superconductivity","Longitudinal proximity effect","lateral inverse proximity effect","x-ray detectors","microcalorimeters","quantum calorimeters","quantum microcalorimeters","bolometers","microwave bolometers","infra-red bolometers","superconducting transition","superconducting phase transition","superconducting phase transition width","transition width","superconducting resistive transition","resistive transition width","excess current effects","R(I,T) surface","R(I,T,B) surface","magnetic flux quantization","exponential critical current","superconducting critical length","spatially varying superconducting order parameter","spatial variation of the superconducting order parameter","superconducting transition temperature","critical current evolution","Josephson critical current","nonuniform superconductivity","longitudinal proximity e ect (LoPE)","lateral inverse proximity e ffect (LaiPE)","Self-fielding effects","flux focusing"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2010 John E. Sadleir"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/18616"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Despite record-setting performance demonstrated by superconducting Transition Edge Sensors (TESs) and growing utilization of the technology, a theoretical model of the physics governing TES devices superconducting phase transition has proven elusive. Earlier attempts to describe TESs assumed them to be uniform superconductors. Sadleir et al. 2010 shows that TESs are weak links and that the superconducting order parameter strength has significant spatial variation. Measurements are presented of the temperature T and magnetic field B dependence of the critical current Ic measured over 7 orders of magnitude on square Mo/Au bilayers ranging in length from 8 to 290 microns. We find our measurements have a natural explanation in terms of a spatially varying order parameter that is enhanced in proximity to the higher transition temperature superconducting leads (the longitudinal proximity effect) and suppressed in proximity to the added normal metal structures (the lateral inverse proximity effect). These in-plane proximity effects and scaling relations are observed over unprecedentedly long lengths (in excess of 1000 times the mean free path) and explained in terms of a Ginzburg-Landau model. Our low temperature Ic(B) measurements are found to agree with a general derivation of a superconducting strip with an edge or geometric barrier to vortex entry and we also derive two conditions that lead to Ic rectification. At high temperatures the Ic(B) exhibits distinct Josephson effect behavior over long length scales and following functional dependences not previously reported. We also investigate how film stress changes the transition, explain some transition features in terms of a nonequilibrium superconductivity effect, and show that our measurements of the resistive transition are not consistent with a percolating resistor network model.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2010-09-21T18:31:19Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Jack_PhD_master_b.tex: 14101 bytes, checksum: ae6136f4acfa1e4ff8f3ab6282996cbe (MD5) Sadleir_John.pdf: 51793940 bytes, checksum: d45b950d54b2ce5593bfd1b987c7c78b (MD5)","Made available in DSpace on 2011-01-21T22:51:46Z (GMT). No. of bitstreams: 3 Sadleir_John.pdf: 51793336 bytes, checksum: 8c241a9787a6db4485aa6be96ca94cc7 (MD5) license.txt: 4061 bytes, checksum: 7661eac6301d543d7662d4f07ac2b487 (MD5) Jack_PhD_master_b.tex: 14101 bytes, checksum: ae6136f4acfa1e4ff8f3ab6282996cbe (MD5)","Item marked as restricted to the 'Administrator' Group (id=1) by William Ingram (wingram2@illinois.edu) on 2011-01-21T22:53:52Z Item is restricted until 2013-01-21T22:53:34Z","Item reinstated by Sarah Shreeves (sshreeve@illinois.edu) on 2013-01-22T11:00:16Z Item was in collections: University of Illinois Dissertations and Theses (ID: 204) Dissertations and Theses - Physics (ID: 445) No. of bitstreams: 4 Sadleir_John.pdf.txt: 714192 bytes, checksum: 53fe0ddc1e19bb0e146ae395f70d6ba9 (MD5) license.txt: 4061 bytes, checksum: 7661eac6301d543d7662d4f07ac2b487 (MD5) Jack_PhD_master_b.tex: 14101 bytes, checksum: ae6136f4acfa1e4ff8f3ab6282996cbe (MD5) Sadleir_John.pdf: 51793336 bytes, checksum: 8c241a9787a6db4485aa6be96ca94cc7 (MD5)","Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2013-01-22T11:00:16Z"]},{"key":"dc:title","label":"Title","values":["Superconducting Transition-Edge Sensor Physics"]}]}],"canonical_facts":{"dc:contributor":["Robinson, Ian K.","Chiang, Tai-Chang","Errede, Steven M.","Selvin, Paul R."],"dc:creator":["Sadleir, John E."],"dc:date":["2011-01-21T22:51:46Z","2013-01-22T11:00:16Z","2010-12"],"dc:description":["Despite record-setting performance demonstrated by superconducting Transition Edge Sensors (TESs) and growing utilization of the technology, a theoretical model of the physics governing TES devices superconducting phase transition has proven elusive. Earlier attempts to describe TESs assumed them to be uniform superconductors. Sadleir et al. 2010 shows that TESs are weak links and that the superconducting order parameter strength has significant spatial variation. Measurements are presented of the temperature T and magnetic field B dependence of the critical current Ic measured over 7 orders of magnitude on square Mo/Au bilayers ranging in length from 8 to 290 microns. We find our measurements have a natural explanation in terms of a spatially varying order parameter that is enhanced in proximity to the higher transition temperature superconducting leads (the longitudinal proximity effect) and suppressed in proximity to the added normal metal structures (the lateral inverse proximity effect). These in-plane proximity effects and scaling relations are observed over unprecedentedly long lengths (in excess of 1000 times the mean free path) and explained in terms of a Ginzburg-Landau model. Our low temperature Ic(B) measurements are found to agree with a general derivation of a superconducting strip with an edge or geometric barrier to vortex entry and we also derive two conditions that lead to Ic rectification. At high temperatures the Ic(B) exhibits distinct Josephson effect behavior over long length scales and following functional dependences not previously reported. We also investigate how film stress changes the transition, explain some transition features in terms of a nonequilibrium superconductivity effect, and show that our measurements of the resistive transition are not consistent with a percolating resistor network model.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2010-09-21T18:31:19Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Jack_PhD_master_b.tex: 14101 bytes, checksum: ae6136f4acfa1e4ff8f3ab6282996cbe (MD5) Sadleir_John.pdf: 51793940 bytes, checksum: d45b950d54b2ce5593bfd1b987c7c78b (MD5)","Made available in DSpace on 2011-01-21T22:51:46Z (GMT). No. of bitstreams: 3 Sadleir_John.pdf: 51793336 bytes, checksum: 8c241a9787a6db4485aa6be96ca94cc7 (MD5) license.txt: 4061 bytes, checksum: 7661eac6301d543d7662d4f07ac2b487 (MD5) Jack_PhD_master_b.tex: 14101 bytes, checksum: ae6136f4acfa1e4ff8f3ab6282996cbe (MD5)","Item marked as restricted to the 'Administrator' Group (id=1) by William Ingram (wingram2@illinois.edu) on 2011-01-21T22:53:52Z Item is restricted until 2013-01-21T22:53:34Z","Item reinstated by Sarah Shreeves (sshreeve@illinois.edu) on 2013-01-22T11:00:16Z Item was in collections: University of Illinois Dissertations and Theses (ID: 204) Dissertations and Theses - Physics (ID: 445) No. of bitstreams: 4 Sadleir_John.pdf.txt: 714192 bytes, checksum: 53fe0ddc1e19bb0e146ae395f70d6ba9 (MD5) license.txt: 4061 bytes, checksum: 7661eac6301d543d7662d4f07ac2b487 (MD5) Jack_PhD_master_b.tex: 14101 bytes, checksum: ae6136f4acfa1e4ff8f3ab6282996cbe (MD5) Sadleir_John.pdf: 51793336 bytes, checksum: 8c241a9787a6db4485aa6be96ca94cc7 (MD5)","Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2013-01-22T11:00:16Z"],"dc:identifier":["http://hdl.handle.net/2142/18616"],"dc:language":["en"],"dc:rights":["Copyright 2010 John E. Sadleir"],"dc:subject":["Josephson Effect","Fraunhofer pattern","Fraunhofer interference pattern","Fraunhofer diffraction pattern","superconducting molybdenum thin films","paraconductivity","Josephson weak-link","superconducting normal metal bilayers","SN trilayers","Superconductivity","Superconductors","proximity effect","inverse proximity effect","superconducting weak-link","SNS","NSN","SNS weak links","SN'S weak links","SS'S","SN heterostructures","superconducting normal-metal heterostructures","critical current effects","rectification","critical current asymmetry","Ic asymmetry","edge-barrier critical current","geometric barrier critical current","stress effects in superconducting thin films","Transition Edge Sensors(TES)","superconducting transition edge sensors","superconducting transition edge sensors(TES)","Superconducting phase thermometers","Percolation theory","random superconducting resistor network","nonequilibrium superconductivity","Longitudinal proximity effect","lateral inverse proximity effect","x-ray detectors","microcalorimeters","quantum calorimeters","quantum microcalorimeters","bolometers","microwave bolometers","infra-red bolometers","superconducting transition","superconducting phase transition","superconducting phase transition width","transition width","superconducting resistive transition","resistive transition width","excess current effects","R(I,T) surface","R(I,T,B) surface","magnetic flux quantization","exponential critical current","superconducting critical length","spatially varying superconducting order parameter","spatial variation of the superconducting order parameter","superconducting transition temperature","critical current evolution","Josephson critical current","nonuniform superconductivity","longitudinal proximity e ect (LoPE)","lateral inverse proximity e ffect (LaiPE)","Self-fielding effects","flux focusing"],"dc:title":["Superconducting Transition-Edge Sensor Physics"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:11Z"}