Experimental studies of magnetoresistance and magnetization on the degenerate magnetic semiconductor ${\mathrm{}\left(\mathrm{GeTe}\right)\mathrm{}}_{99}$${\mathrm{}\left(\mathrm{MnTe}\right)\mathrm{}}_1$ indicate that the transport properties correlate with the square of the magnetization both above and below the ferromagnetic transition. A simple spin-flip scattering mechanism yields a value for $\left|J_{s-d}\right|$ of 0.8 eV in agreement with the dependence of the Curie-Weiss temperature on manganese concentration.

• Received 8 May 1973

DOI:https://doi.org/10.1103/PhysRevB.8.4262