{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/80561"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/80561","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Probing the Superconducting Gap of Lead With Ballistic Phonons","abstract":"The assumption that quasiparticles are all in thermal equilibrium with the helium-bath leads to erroneous results for temperature dependences of phonon absorption. Instead, we assume that the phonon-imaging experiment creates small regions of raised temperature that contribute non-equilibrium quasiparticles to the system. Accounting for these quasiparticles, we extract consistent values of both the superconducting energy gap parameter and the superconducting phonon absorption coefficient for all phonon-imaging data. Measured values of the energy gap (Delta = 1.32+/-0.07 meV)are consistent with accepted values from tunneling measurements. Phonon imaging experiments do not support the existence of an SDW ground state in Pb.","abstract_html":"The assumption that quasiparticles are all in thermal equilibrium with the helium-bath leads to erroneous results for temperature dependences of phonon absorption. Instead, we assume that the phonon-imaging experiment creates small regions of raised temperature that contribute non-equilibrium quasiparticles to the system. Accounting for these quasiparticles, we extract consistent values of both the superconducting energy gap parameter and the superconducting phonon absorption coefficient for all phonon-imaging data. Measured values of the energy gap (Delta = 1.32+/-0.07 meV)are consistent with accepted values from tunneling measurements. Phonon imaging experiments do not support the existence of an SDW ground state in Pb.","abstract_has_math":false,"creators":["Head, Timothy Lawrence"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Dale Van Harlingen"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-25T20:03:04Z","date_published":"2015-09-25T20:03:04Z","updated_at":"2026-07-22T22:26:14Z","subjects":["Physics, Condensed Matter"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3301145"],"render_values":[{"text":"(MiAaPQ)AAI3301145","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/80561","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Dale Van Harlingen"]},{"key":"dc:creator","label":"Author","values":["Head, Timothy Lawrence"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-25T20:03:04Z","10000-01-01","2007"]},{"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"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/80561","(MiAaPQ)AAI3301145"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The assumption that quasiparticles are all in thermal equilibrium with the helium-bath leads to erroneous results for temperature dependences of phonon absorption. Instead, we assume that the phonon-imaging experiment creates small regions of raised temperature that contribute non-equilibrium quasiparticles to the system. Accounting for these quasiparticles, we extract consistent values of both the superconducting energy gap parameter and the superconducting phonon absorption coefficient for all phonon-imaging data. Measured values of the energy gap (Delta = 1.32+/-0.07 meV)are consistent with accepted values from tunneling measurements. Phonon imaging experiments do not support the existence of an SDW ground state in Pb.","Made available in DSpace on 2015-09-25T20:03:04Z (GMT). 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Instead, we assume that the phonon-imaging experiment creates small regions of raised temperature that contribute non-equilibrium quasiparticles to the system. Accounting for these quasiparticles, we extract consistent values of both the superconducting energy gap parameter and the superconducting phonon absorption coefficient for all phonon-imaging data. Measured values of the energy gap (Delta = 1.32+/-0.07 meV)are consistent with accepted values from tunneling measurements. Phonon imaging experiments do not support the existence of an SDW ground state in Pb.","Made available in DSpace on 2015-09-25T20:03:04Z (GMT). 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