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Specific heats of fast-quenched Au-Ni alloys

Specific heats of fast-quenched Au-Ni alloys 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Low Temperature Physics Springer Journals

Specific heats of fast-quenched Au-Ni alloys

Journal of Low Temperature Physics , Volume 28 (6) – Nov 3, 2004

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References (20)

Publisher
Springer Journals
Copyright
Copyright
Subject
Physics; Condensed Matter Physics; Characterization and Evaluation of Materials; Magnetism, Magnetic Materials
ISSN
0022-2291
eISSN
1573-7357
DOI
10.1007/BF00661441
Publisher site
See Article on Publisher Site

Abstract

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

Journal of Low Temperature PhysicsSpringer Journals

Published: Nov 3, 2004

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