抄録
The electrical resistivities of Gu–Mn and Ag–Mn alloys with Mn concentration from 1 to 25 and 22 atomic percents, respectively, have been measured from 4 to 1000 K. The temperature dependence of the resistivity in both alloys shows no sharp anomaly but a broad maximum above the Néel temperature. Above this maximum temperature, the resistivity decreases with increasing temperature. The magnetic part of the resistivity is estimated by subtracting the resistivity of pure Cu or Ag from the observed one. For all the Mn concentrations studied, the temperature dependence of the magnetic resistivity is well expressed as Rmag(T)=−c(X+Yc)ln(T2+Z2c2)1⁄2+R0, where c is the concentration of Mn, T the temperature and X, Y, Z and R0 the constants. This fact suggests that in concentrated alloys the RKKY interaction between Mn impurities plays an important role in the s-d exchange scattering of conduction electrons.
