Influence of s-d Exchange Interaction on Universal Conductance Fluctuations in ${\mathrm{Cd}}_{1-\mathit{x}}{\mathrm{Mn}}_{\mathit{x}}Te:In$

We present millikelvin studies of diffusive charge transport in submicron wires of $n^{+}-\mathrm{C}\mathrm{d}\mathrm{T}\mathrm{e}$ and $n^{+}{-\mathrm{C}\mathrm{d}}_{0.99}{\mathrm{Mn}}_{0.01}\mathrm{Te}$ epilayers. In contrast to expectations, the paramagnetic Mn impurities leave a mean amplitude of reproducible magnetoconductance fluctuations unchanged but decrease the fluctuation correlation field. These findings are interpreted by invoking a new driving mechanism of the magnetoconductance fluctuations—the redistribution of the electrons between energy levels of the system, induced by the giant $s$- $d$ exchange spin splitting.