We investigate mechanisms of electric-field-induced conduction in high-quality chromia
crystals. A crossover is observed between space-charge limited conduction and the Frenkel-
Poole mechanism with increasing temperature, with the crossover occurring in the vicinity of
the Neel temperature of this material. From an analysis of the Frenkel-Poole conduction, we
infer the presence of charge traps that lie approximately 0.5 eV below the conduction-band
edge. Our experiments confirm the excellent dielectric properties of chromia, a result that is …