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- W2031969040 abstract "Abstract The optical gap, dc electrical conductivity and thermoelectromotive forces (thermopower) at different temperatures were measured for glassy Cu 15 As 35 Se 50 . The difference between the activation energy of the dc electrical conductivity and of the thermopower is found to be ≈ 0.22 eV. The origin of this difference is discussed using: 1. (i) the Overhof-Beyer model for transport in extended states modified by long-range potential fluctuations, 2. (ii) the two-channel model, 3. (iii) nearest-neighbour hopping in a rigid impurity band and 4. (iv) small polaron transport. Experimental results are consistent with nearest-neighbour hopping in a rigid impurity band or for the small polaron transport. Further experimental study (e.g. the temperature dependence of the Hall mobility) is necessary to distinguish between these possibilities." @default.
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- W2031969040 date "1993-11-01" @default.
- W2031969040 modified "2023-10-16" @default.
- W2031969040 title "On the dc electrical conductivity in glassy Cu15As35Se50" @default.
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- W2031969040 doi "https://doi.org/10.1016/0167-577x(93)90060-b" @default.
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