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- W2023378325 abstract "This study of the specific heats of dilute magnetic $ensuremath{alpha}$-phase Cu-Au(Fe) alloys is a continuation of our work on dilute Fe in binary-host alloys. Our previous specific-heat results for the $ensuremath{alpha}$-phase Cu-Al(Fe) system indicated that the Kondo effect depended on the particular local environment of the Fe impurity. The present study was motivated by resistivity experiments which suggested for Cu-Au(Fe) a contrasting picture where local-environment effects are not important. The specific heats of a series of $ensuremath{alpha}$-phase Cu-Au and dilute magnetic Cu-Au(Fe) alloys with Fe concentrations near 0.04 at.% were measured over the temperature range 1-10 K. The alloys had Au concentrations of 2.4, 4.8, and 10 at.%. The excess specific heat due to the Fe impurities show a broad peak characteristic of the Kondo effect. A recently derived theoretical expression for the Kondo effect in the specific heat was successful in fitting these Cu-Au(Fe) results and the Cu(Fe) results of other investigators. The contribution from the Fe impurities for the various alloys had the same functional dependence on a scaled temperature $frac{T}{{T}_{K}}$, where the ${T}_{K}$ decreased with increasing Au concentration. This agreed with the existence of a universal resistance curve for Cu-Au(Fe) found by other experimenters. Comparisons are made with our previous specific-heat result for the Cu-Al(Fe) system which could not be fit with a universal curve. It is suggested that local-environment effects are important in the Cu-Al(Fe) system in contrast with the Cu-Au(Fe) system." @default.
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- W2023378325 date "1973-02-01" @default.
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- W2023378325 title "Specific Heats of Dilute Magneticα-Phase Cu-Au(Fe) Alloys" @default.
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- W2023378325 doi "https://doi.org/10.1103/physrevb.7.1066" @default.
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