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The low-temperature specific heats of liquid-quenched Au-Ni alloys containing between 20 and 52 at % Ni have been measured using ac calorimetry techniques. The specific heats of alloys near the critical composition for ferromagnetism (42–44 at % Ni) contain an anomalous contribution, similar to that observed in Cu-Ni alloys, seen as a significant upturn below 6 K in plots ofC/T vs.T 2. The anomalous contribution can be interpreted in terms of a magnetic cluster contribution, which is independent of temperature above 2 K. The magnitude of the cluster contribution is greatest at the critical composition, and is 2–3 times larger than the cluster contribution for Cu-Ni alloys. This suggests that these liquid-quenched Au-Ni alloys contain a greater concentration of magnetic clusters than the Cu-Ni alloys. The average cluster moment is therefore smaller, since the saturation magnetizations are comparable.
Journal of Low Temperature Physics – Springer Journals
Published: Nov 3, 2004
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