Abstract
We describe a technique for performing high resolution calorimetry on samples with very small heat capacity (∼10μJ/K). This involves using ac calorimetry, in which the sample is subjected to temperature oscillations, with simultaneous dc regulation of the average temperature. This method works well for small samples of 4 He, where adiabatic calorimetry would be impossible. We study the frequency response of our system using a modified Sullivan-Seidel equation, which allows for small temperature inhomogeneities at high frequencies. These procedures enable one to obtain heat capacity data possessing a high degree of absolute accuracy.
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Mehta, S., Gasparini, F. High Resolution Calorimetry on μMole Samples of 4He Near Tλ . Journal of Low Temperature Physics 110, 287–292 (1998). https://doi.org/10.1023/A:1022576514910
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DOI: https://doi.org/10.1023/A:1022576514910