The specific heat of high-purity copper has been measured over the temperature range of 0.03–0.2 K. It is shown that an anomaly appears in the specific heats of some samples. The temperature dependence is ~T \s-2 at T \> 0.03 K, and at 0.03 K the magnitude is equal to that of the contribution from conduction electrons. We have not been able to explain the origin of this anomaly.
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This work was supported in part by the U.S. Department of Energy under contract DE-AC02-76ER01198.
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Cotts, E.J., Anderson, A.C. The specific heat of copper at temperatures below 0.2 K. J Low Temp Phys 43, 437–443 (1981). https://doi.org/10.1007/BF00115606
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DOI: https://doi.org/10.1007/BF00115606