Electrical resistivity in disordered NiMn alloys around the multicritical point

We present the results of the temperature dependence of the electrical resistivity, ρ of disordered Ni100−xMnx alloys (x=15-37) in the temperature range 5≤T≤350 K. We find distinctly different behavior of ρ(T) below and above the multicritical point (x=25) recently found by us through detailed magnetic measurements in the same set of samples. In the ferromagnetic/ferro-spin-glass (x≤25) phase, ρ(T) is dominated by the ferro-spin-glass phase contribution below the glass transition temperature and above it by large electron-phonon and electron-magnon s-d scattering. In the spin-glass/antiferromagnetic regime (x≥25) resistivity minima show up due to larger disorder with resistivity ∼(150-185) μΩ cm. Here ρ(T) is dominated by electron-electron interactions ∼−√T and electron-phonon s-d scattering.