Hopping conduction in Mn-doped ZnO

Han, Jiaping; Shen, Mingrong; Cao, Wenwu; Senos, A. M. R.; Mantas, P. Q.
January 2003
Applied Physics Letters;1/6/2003, Vol. 82 Issue 1, p67
Academic Journal
The dc and ac conductivities of Mn-doped ZnO were investigated at temperatures from 10 to 100 K. The temperature dependence of the dc conductivity from 10 to 100 K shows an abrupt change at ∼ 18 K, manifesting a much lower activation energy for conduction below 18 K. From 10 to 18 K, the ac conductivity, σ[sub ac](Ω), varies as σ[sub ac](ω) = A ω[sup s] in the frequency range from 10² to 10[sup 6] Hz with s in the range of 0.6-1. The dc and ac conductivity observations suggest that the dominant conduction mechanism at temperatures between 10 to 18 K in these samples is a hopping conduction.


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