Temperature dependence of the electrical resistivity of R6(Fesub(1-x)Mnsub(x))23 compounds in the temperature range 4.2 to 300 K

The temperature dependence of the electrical resistivity rho of binary R6Mn23, R6Fe23 (R=Y,Dy,Ho,Er,Tm) and pseudobinary R6(Fesub(1-x)Mnsub(x))23 (R=Y,Er,Ho) compounds has been determined by a four-probe measuring technique in the temperature range 4 to 300 K. The binary compounds exhibit a rho prop. T2 dependence at low temperatures, while above 100 K a negative curvature of the rho-T-curves is observed. These experimental results are discussed on the basis of electron-spin wave scattering in the low temperature range and on the basis of s-d scattering in the high temperature range, taking explicitly into account the temperature dependence of the chemical potentials. The pseudobinary compounds generally exhibit a decreasing resistivity with increasing temperature, combined with a high residual resistivity. These facts are explained by the so-called strong scattering mechanism and the appearance of 'quasilocalized' states. (Auth.)