Measurement of Low Temperature Thermal Properties of Microcalorimeters Using Johnson Noise Thermometry

<p>Calorimetric measurments and thermal transport measurments through a-Si_xN_y 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>

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Year dc:date.available

2014

Author dc:creator

• Bassett, Dain

Contributors dc:contributor

• Barry L. Zink, Ph.D.
• Corinne Lengsfeld
• Kingshuk Ghosh
• Mark Siemens
• Maria M. Calbi

• Heat capacity
• Johnson noise
• Low temperature
• Thermal trasport
• Physical Sciences and Mathematics
• Physics

Statement dc:rights

• <p>Copyright is held by the author. User is responsible for all copyright compliance.</p>

Language dc:language

en

Repository record dc:identifier

https://digitalcommons.du.edu/etd/58

OAI identifier oai:identifier

oai:digitalcommons.du.edu:etd-1057