Thermoelectric power and conductivity measurements were carried out on Ti-doped single crystals of magnetite in the temperature range 70-300 K. The analysis of the measurements supports the model in which the electrical conduction below the Verwey transition takes place on two energy levels separated by a gap of about 0.12 eV. Evidence is found that the mobility of the electrons is thermally activated above as well as below the Verwey transition, indicating phonon-assisted tunneling.
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Kuipers et al. (1979) studied this question.
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