Specific Heat below 3°K of Silver-Gold Alloys

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Abstract
The electronic specific heats of Ag-Au alloys for all compositions are slightly less than those calculated by a linear interpolation between the electronic specific heats of the pure components, the maximum difference being about 3%. The theories of Stern and of Haga claim, respectively, that this difference is the result of electron-impurity and electron-phonon interactions. The results fit Stern's relation rather well. An important outcome of this work was the discovery of a significant nuclear specific term in these nonmagnetic cubic alloys. This term has been attributed to electric field gradients, resulting from the random distribution of the two components on the lattice, interacting with the nuclear electric quadrupole moment of gold. The maximum value of this term (∼1.4 μcal °K/g-at. gold) is observed for an equiatomic alloy. The Debye temperatures of the alloys are slightly higher than those given by a linear interpolation between the two components, the maximum difference being about 2½%.

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