{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/25739"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/25739","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Thermal conductivity of superconducting niobium","abstract":"The magnetic field and temperature dependence of the thermal conductivity of superconducting niobium have been measured in magnetic fields which ranged .. from zero to above the critical fields, and for temperatures which ranged from 0.31 K to above the transition temperature. Measurements were made on a single crystal cylindrical specimen for which R300/R ~ 200. The thermal 4.2:N conductivity in the superconducting state exhibited a maximum near 1.80 K. This maximum has been attributed to enhanced lattice conductivity as the electrons cono dense into the ground state. Below 0.6 K the superconducting state thermal conductivity showed an anomalous 3 departure from the expected T dependence for phonons. The departure has been interpreted in terms of a two energy gap model. Magnetic field measurements with the field parallel to the heat flow showed a deep minimum between H 1 and H at the temperature of the maximum C C2 and at lower temperatures. The experimental results near HC2 have been compared with Maki's prediction that (dKII/dH)CX:(HC2-H)-1/2. Good qualitative agreement was found) but the quantatative results gave a density of states somewhat lower than the values obtained from specific heat measurements.","abstract_html":"The magnetic field and temperature dependence of the thermal conductivity of superconducting niobium have been measured in magnetic fields which ranged .. from zero to above the critical fields, and for temperatures which ranged from 0.31 K to above the transition temperature. Measurements were made on a single crystal cylindrical specimen for which R300/R ~ 200. The thermal 4.2:N conductivity in the superconducting state exhibited a maximum near 1.80 K. This maximum has been attributed to enhanced lattice conductivity as the electrons cono dense into the ground state. Below 0.6 K the superconducting state thermal conductivity showed an anomalous 3 departure from the expected T dependence for phonons. The departure has been interpreted in terms of a two energy gap model. Magnetic field measurements with the field parallel to the heat flow showed a deep minimum between H 1 and H at the temperature of the maximum C C2 and at lower temperatures. The experimental results near HC2 have been compared with Maki's prediction that (dKII/dH)CX:(HC2-H)-1/2. Good qualitative agreement was found) but the quantatative results gave a density of states somewhat lower than the values obtained from specific heat measurements.","abstract_has_math":false,"creators":["Carlson, Jon Ross"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Satterthwaite, C.B."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-07-08T19:38:18Z","date_published":"2011-07-08T19:38:18Z","updated_at":"2026-07-22T22:25:26Z","subjects":["thermal conductivity","superconducting niobium","magnetic field","single crystals"],"languages":["en"],"rights":["1968 Jon Ross Carlson"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["6083123"],"render_values":[{"text":"6083123","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/25739","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Satterthwaite, C.B."]},{"key":"dc:creator","label":"Author","values":["Carlson, Jon Ross"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-07-08T19:38:18Z","10000-01-01","1968"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","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."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["thermal conductivity","superconducting niobium","magnetic field","single crystals"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1968 Jon Ross Carlson"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["6083123","http://hdl.handle.net/2142/25739"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The magnetic field and temperature dependence of the thermal conductivity of superconducting niobium have been measured in magnetic fields which ranged .. from zero to above the critical fields, and for temperatures which ranged from 0.31 K to above the transition temperature. Measurements were made on a single crystal cylindrical specimen for which R300/R ~ 200. The thermal 4.2:N conductivity in the superconducting state exhibited a maximum near 1.80 K. This maximum has been attributed to enhanced lattice conductivity as the electrons cono dense into the ground state. Below 0.6 K the superconducting state thermal conductivity showed an anomalous 3 departure from the expected T dependence for phonons. The departure has been interpreted in terms of a two energy gap model. Magnetic field measurements with the field parallel to the heat flow showed a deep minimum between H 1 and H at the temperature of the maximum C C2 and at lower temperatures. The experimental results near HC2 have been compared with Maki's prediction that (dKII/dH)CX:(HC2-H)-1/2. Good qualitative agreement was found) but the quantatative results gave a density of states somewhat lower than the values obtained from specific heat measurements.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-08T19:38:18Z No. of bitstreams: 1 1968_Carlson.pdf: 2346219 bytes, checksum: 0849b14e1f59a41aaf41dd267cf8d7e3 (MD5)","Made available in DSpace on 2011-07-08T19:38:18Z (GMT). No. of bitstreams: 1 1968_Carlson.pdf: 2346219 bytes, checksum: 0849b14e1f59a41aaf41dd267cf8d7e3 (MD5) Previous issue date: 1968","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-08T19:38:18Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:33:18-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["Thermal conductivity of superconducting niobium"]}]}],"canonical_facts":{"dc:contributor":["Satterthwaite, C.B."],"dc:creator":["Carlson, Jon Ross"],"dc:date":["2011-07-08T19:38:18Z","10000-01-01","1968"],"dc:description":["The magnetic field and temperature dependence of the thermal conductivity of superconducting niobium have been measured in magnetic fields which ranged .. from zero to above the critical fields, and for temperatures which ranged from 0.31 K to above the transition temperature. Measurements were made on a single crystal cylindrical specimen for which R300/R ~ 200. The thermal 4.2:N conductivity in the superconducting state exhibited a maximum near 1.80 K. This maximum has been attributed to enhanced lattice conductivity as the electrons cono dense into the ground state. Below 0.6 K the superconducting state thermal conductivity showed an anomalous 3 departure from the expected T dependence for phonons. The departure has been interpreted in terms of a two energy gap model. Magnetic field measurements with the field parallel to the heat flow showed a deep minimum between H 1 and H at the temperature of the maximum C C2 and at lower temperatures. The experimental results near HC2 have been compared with Maki's prediction that (dKII/dH)CX:(HC2-H)-1/2. Good qualitative agreement was found) but the quantatative results gave a density of states somewhat lower than the values obtained from specific heat measurements.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-08T19:38:18Z No. of bitstreams: 1 1968_Carlson.pdf: 2346219 bytes, checksum: 0849b14e1f59a41aaf41dd267cf8d7e3 (MD5)","Made available in DSpace on 2011-07-08T19:38:18Z (GMT). No. of bitstreams: 1 1968_Carlson.pdf: 2346219 bytes, checksum: 0849b14e1f59a41aaf41dd267cf8d7e3 (MD5) Previous issue date: 1968","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-08T19:38:18Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:33:18-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"],"dc:identifier":["6083123","http://hdl.handle.net/2142/25739"],"dc:language":["en"],"dc:rights":["1968 Jon Ross Carlson"],"dc:subject":["thermal conductivity","superconducting niobium","magnetic field","single crystals"],"dc:title":["Thermal conductivity of superconducting niobium"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:26Z"}