Low-Temperature Specific Heat of Ni-Base fcc Solid Solutions with Cu, Zn, Al, Si, and Sb

For Ni-Cu solid solutions around the equiatomic composition the low-temperature specific-heat term linear in temperature was found to contain a magnetic contribution. The measured $\gamma$ for these alloys is, therefore, not representative of the electronic specific heat. The presence of magnetic moments in Ni-Cu alloys with Cu contents as high as 0.6 atomic fraction may be concluded from the known magnetic properties, as well as from the low-temperature specific-heat results. The $\gamma$ values for the Ni-Zn alloys vary with the electron concentration in a manner analogous to that observed for Ni-Cu alloys, although the available data are much more limited.