Actual bolometer used to measure sample Au-2 with the thin gold film heater, and bare Ge NTD thermometer on top (left). Schematic view (right) of a typical bolometer constructed for measuring the heat capacities of holmium and erbium implanted gold films.
Sample thermometer resistance vs time (left) and temperature vs time (right) for sample Au-2 at a base temperature of 110 mK.
Exponential fit of the relaxation plot to determine τ.
Measured heat capacitances of all samples are plotted as a function of temperature. The combined heat capacitance of substrate, heater, and thermometer (black squares) starts dominating above 200 mK.
Measured specific heat capacities of all samples in the temperature range 70 to 150 mK (left). Polynomial fits using only linear and cubical terms (right).
Specific heat capacity of individual samples at 100 mK (extracted from polynomial fitting parameters). The red line represents the specific heat capacity of pure gold from the literature.
Properties of the samples used.
The values of fitting parameters obtained from polynomial fit of individual data sets. Specific heat of each sample at 0.1 K was calculated using the fitting parameters.
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