We present low-temperature-resistivity measuremtents on five ${\mathrm{Ni}}_{1-x}{\mathrm{Mn}}_x$ alloys ($x=0.21, 0.25, 0.28, 0.30, \mathrm{and} 0.33$). Each alloy except ${\mathrm{Ni}}_{0.79}$${\mathrm{Mn}}_{0.21}$ exhibits a resistivity minimum which we associate with the onset of a magnetic transition from a mixed (spin-glass plus ferromagnetic order) or frustrated state towards a ferromagnetic state. This interpretation is supported by magnetoresistance data.

• Received 20 December 1982

DOI:https://doi.org/10.1103/PhysRevB.28.455