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A large anisotropy in the electrical conductivity of CdS appearing below 30^∘{}K is reported. This anisotropy casts serious doubt on the customary view that impurity hopping supplies the low-temperature conductivity. We present a new model for this conductivity based upon the electronic screening of the piezoelectric polarization around dislocations. Numerical solutions of the highly nonlinear Poisson equation quantitatively justify this model.
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A. R. Hutson (1981) studied this question.
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