{"id":{"repo_id":"denver","oai_identifier":"oai:digitalcommons.du.edu:etd-1057"},"canonical_url":"https://search.dev.ndltd.org/etd/denver/oai:digitalcommons.du.edu:etd-1057","repository":{"repo_id":"denver","name":"University of Denver","base_url":"https://digitalcommons.du.edu/do/oai/"},"display":{"title":"Measurement of Low Temperature Thermal Properties of Microcalorimeters Using Johnson Noise Thermometry","abstract":"<p>Calorimetric measurments and thermal transport measurments through a-Si<sub>x</sub>N<sub>y</sub> suspended membranes have been performed to further the understanding of low temperature thin film thermal transport, and understand the interesting physics present within an amorphous dielectric material. The thermal properties of several calorimeters have been measured to understand the geometric dependence on transport phenomenon. We analyze and compare our results with observations of previous measurements, and with those indicating quantum limited thermal transport. We see strong indications of changes to the physical mechanism transporting heat through these materials as temperature changes from 50 mK to 2 K. We have also developed a relaxation calorimetric measurement for use with Johnson Noise Thermometry.</p>","abstract_html":"&lt;p&gt;Calorimetric measurments and thermal transport measurments through a-Si&lt;sub&gt;x&lt;/sub&gt;N&lt;sub&gt;y&lt;/sub&gt; suspended membranes have been performed to further the understanding of low temperature thin film thermal transport, and understand the interesting physics present within an amorphous dielectric material. The thermal properties of several calorimeters have been measured to understand the geometric dependence on transport phenomenon. We analyze and compare our results with observations of previous measurements, and with those indicating quantum limited thermal transport. We see strong indications of changes to the physical mechanism transporting heat through these materials as temperature changes from 50 mK to 2 K. We have also developed a relaxation calorimetric measurement for use with Johnson Noise Thermometry.&lt;/p&gt;","abstract_has_math":false,"creators":["Bassett, Dain"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":null,"degree_department":null,"school":null,"contributors":["Barry L. Zink, Ph.D.","Corinne Lengsfeld","Kingshuk Ghosh","Mark Siemens","Maria M. Calbi"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-03-01T08:00:00Z","date_published":"2014-03-01T08:00:00Z","updated_at":"2026-07-24T02:02:19Z","subjects":["Heat capacity","Johnson noise","Low temperature","Thermal trasport","Physical Sciences and Mathematics","Physics"],"languages":["en"],"rights":["<p>Copyright is held by the author. User is responsible for all copyright compliance.</p>"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://digitalcommons.du.edu/etd/58","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Barry L. Zink, Ph.D.","Corinne Lengsfeld","Kingshuk Ghosh","Mark Siemens","Maria M. 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We see strong indications of changes to the physical mechanism transporting heat through these materials as temperature changes from 50 mK to 2 K. We have also developed a relaxation calorimetric measurement for use with Johnson Noise Thermometry.</p>"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Measurement of Low Temperature Thermal Properties of Microcalorimeters Using Johnson Noise Thermometry"]}]}],"canonical_facts":{"dc:contributor":["Barry L. Zink, Ph.D.","Corinne Lengsfeld","Kingshuk Ghosh","Mark Siemens","Maria M. Calbi"],"dc:creator":["Bassett, Dain"],"dc:date.available":["2001-01-01T08:00:00Z"],"dc:description.abstract":["<p>Calorimetric measurments and thermal transport measurments through a-Si<sub>x</sub>N<sub>y</sub> suspended membranes have been performed to further the understanding of low temperature thin film thermal transport, and understand the interesting physics present within an amorphous dielectric material. The thermal properties of several calorimeters have been measured to understand the geometric dependence on transport phenomenon. We analyze and compare our results with observations of previous measurements, and with those indicating quantum limited thermal transport. We see strong indications of changes to the physical mechanism transporting heat through these materials as temperature changes from 50 mK to 2 K. We have also developed a relaxation calorimetric measurement for use with Johnson Noise Thermometry.</p>"],"dc:format":["application/pdf"],"dc:identifier":["https://digitalcommons.du.edu/etd/58"],"dc:language":["en"],"dc:rights":["<p>Copyright is held by the author. User is responsible for all copyright compliance.</p>"],"dc:subject":["Heat capacity","Johnson noise","Low temperature","Thermal trasport","Physical Sciences and Mathematics","Physics"],"dc:title":["Measurement of Low Temperature Thermal Properties of Microcalorimeters Using Johnson Noise Thermometry"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-24T02:02:19Z"}