Principles of thermal measurements of samples with minimal heat capacity (< 100 nJ/K) in the high B/T regime using quartz tuning forks and helium 3

Piezoelectrically driven quartz devices have widespread use in various measurement systems and regimes, and by using a vibrating quartz device inside a volume of helium-3, one can probe the temperature dependent viscosity of that helium-3. This viscosity probing is a thermometry technique that is used to measure temperatures below 1 millikelvin, and it is not sensitive to high magnetic fields from many modern superconducting magnets. A miniaturized thermometer device uses these principles to make novel measurements of samples with less than 100 nJ/K heat capacities. We will explore the design and implementation of this method for use with heat capacity measurements at millikelvin temperatures and high magnetic fields of 14 tesla and then discuss the results of some preliminary measurements.