The effect of lattice defects on the low-temperature heat capacity of copper

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Abstract
Low-temperature specific heats of a heavily cold-worked and annealed high-purity copper were measured in the temperature range 1·5–4·2°K. The results are compared with similar measurements reported previously (Ahlers 1966). The enhancement of the electronic specific heat coefficient γ is in excellent quantitative agreement with the calculated increase of the specific heat due to vibrations of mobile dislocations (Granato 1958). In the temperature range of the measurement, this increase is proportional to the dislocation density and the temperature. A phenomenological approach to the study of the properties of a liquid via a heavily deformed solid state is discussed in terms of the stored energy and entropy of cold work.