Temperature variation of electrical conductivity in two crystallographic directions (σ∥ and σ⟂) of p-Bi2Te3 crystals has been measured. The anisotropic factor, σ∥/σ⟂, shows an exponential form involving an activation energy. This can be interpreted as an effect of defects between the layers on the electronic density of states.
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Nagao et al. (2000) studied this question.
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