Abstract
The specific heats of three Cu-Ni and two Cu-Ni-Fe samples have been measured in the range 0.4–6 K at compositions in the range 20–43% Ni and ∼0–0.2% Fe. The results are described in terms of a Schottky function from which the number of levels and the cluster concentration are determined for each composition. Addition of iron to the 20%-Ni sample results in ∼1/2 cluster per Fe atom added. The specific heat increases in a magnetic field (known for one sample), which is compatible with the Schottky-like function description of the anomalous term in the specific heat, but is incompatible with the Einstein function description. Another possible interpretation of the observed specific heat anomalies is given in terms of an intercluster cooperative phenomenon.
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Supported in part by the Office of Saline Water, Department of Interior. Contribution of the National Bureau of Standards. Not subject to copyright.
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Falge, R.L., Wolcott, N.M. Cluster specific heats in copper-rich Cu-Ni alloys: The effect of iron. J Low Temp Phys 5, 617–650 (1971). https://doi.org/10.1007/BF00628414
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DOI: https://doi.org/10.1007/BF00628414