The electrical conductivity of V 2 O 3 in the antiferromagnetic insulating (AFI) phase has been measured on multidomain and single-domain crystals over a conductivity range of more than five orders of magnitude, and for the temperature range 160-40 K. The intrinsic mechanism for conductivity in the AFI phase for a singledomain sample of well-defined orientation was determined, using a special experimental setup that minimized mechanical stresses. The conductivity in the AFI phase of the unstressed, single-domain crystal was comparable to the conductivity of the multidomain crystal, but the two samples differ in their temperature dependence. The results were interpreted by analyzing the effect of thermal lattice vibrations on the resonance integral. The polaron localization radius was found to be of the order of the lattice vibration amplitudes.
PACS: 72.20.Dp; 72.60.+g The temperature dependence of electrical conductivity of CuIr 2 S 4 has been measured. In the range 4.2-50 K the conductivity can be described in terms of the Mott law, while in the range 50-200 K the experimental data are best described in terms of a small polaron model, taking into account the influence of the temperature dependence of the vibrations of the atoms in their effect on the resonance integral.
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