Abstract
We present results of resistivity and Hall-effect measurements performed on n-type as-grown ${\mathrm{Cd}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Fe}}_{\mathit{x}}$Se crystals with 0x\ensuremath{\le}0.07 in the temperature range 1.7--300 K. For T80 K, activated behavior in conductivity is observed. We found that ${\mathit{E}}_{1}$ (the energy required to raise electrons from the donor center to the conduction band) and ${\mathit{E}}_{3}$ (the activation energy in hopping conduction) vary strongly with composition x. These results are discussed in the framework of both Anderson localization (produced by substitutional disorder) and random fluctuations in composition and central-cell potentials.
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