Abstract
The resistance of pure and Nb doped VO 2 and the Seebeck coefficient of Nb doped VO 2 have been measured in the temperature range of 78–360 K. A simple analysis of the results shows that above 140 K and below the transition temperature the effective density of states in the conduction band of VO 2 is of the order of (but larger than) one state per vanadium atom. This high effective density of states is consistent with the large effective mass (and low mobility) of electrons in this material. It is shown also that in this range, the temperature dependence of the electronic mobility in VO 2 is T −γ where γ ⪆ 2. Additional results are discussed in the text.
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