Effects of Temperature Scale Differences on the Analysis of Heat Capacity Data: The Specific Heat of Copper from 1 to 30 K

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Abstract
Specific heat data for copper from 1 to 30 K which were published previously have been reanalyzed using five different experimental temperature scales which could be associated with the germanium resistance thermometer used in these experiments. Three of the scales which were derived from a common set of paramagnetic salt thermometer data give comparable results with maximum differences of 0.3% that vary slowly with temperature. The other two scales, one of which was derived from gas thermometer measurements and the other from the NBS‐Acoustic scale, show systematic oscillatory differences from this smooth behavior. These differences can be understood analytically in terms of the absolute temperature differences and the differing sizes of the degrees for the scales. Smooth copper specific heat values which are based on the magnetic thermometer smoothed scales are given for the 1–30 K interval. A comparison of these results as analyzed in terms of T58 and other published data suggests that the major differences which exist in the 1–4 K region cannot be ascribed to thermometry but probably are due to differences in samples or techniques.