Low-temperature specific heat measurements of simple divalent amorphous Mg0.7Zn0.3alloy

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Abstract
The low-temperature specific heats of an amorphous Mg0.7Zn0.3 alloy and of the same alloy subjected to heat treatment are measured over the temperature range 1.6-4.2K. All the results fit well to the simple equation C= gamma T+ alpha T3. The electronic specific heat coefficient gamma for the amorphous phase is found to be very close to the free-electron value on the assumption that both Mg and Zn donate two conduction electrons per atom. The lattice specific heat is well described by the Debye model in sharp contrast with the metal-metalloid glasses, where the departure from the T3 dependence is appreciable. This is attributed to the difference in the packing fraction of atoms between the metal-metal and metal-metalloid glasses. The electrical resistivity is also measured over the temperature range 4.2-300K. The reliable determination of 2kF/Kp allowed discussion of the observed negative TCR in relation to the extended Ziman theory.

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