The electrical and thermal conductivities of Cu-4, 10, and 20 at.% Ni from 1-25 K

Electrical and thermal conductivities of Cu-4, 10, and 20 at.% Ni are presented from 1-25 K. These alloy concentrations are typical of those being used in some composite superconductors to minimize electrical coupling between filaments during rapidly changing fields. Data are presented for both highly annealed and heavily deformed specimens. For a given alloy, the electrical conductivities increase as a result of deformation and can vary by nearly 10%. The thermal conductivities decrease as a result of deformation and can vary by greater than a factor of two for K.