Abstract
A gigantic enhancement of dielectric constant by UV light irradiation is reported for the first time in the quantum paraelectric family of perovskite oxides, such as SrTiO 3 and KTaO 3 , under a weak DC field. The enhancement has not been observed in ferroelectric SrTi 18 O 3 induced by substitution of 18 O for 16 O. The present result suggests a new class of light-switching phenomena controllable externally.
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