科研之友
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摘要
We present observations and an explanation of a photorefractive effect in strained centrosymmetric KTN and KLTN crystals in the absence of an externally applied electric field. Centrosymmetric crystals are forbidden to display the classical photorefractive effect without application of an applied field. Nevertheless, in diffraction experiments, centrosymmetric KTN:Cu and KLTN:Cu crystals show index changes of up to 1.7 x 10(-5) and photorefractive response at more than 120-degrees-C above the phase transition. Experiments described here allow us to conclude that a Jahn-Teller relaxation of the spatially modulated Cu2+ dopant concentration is responsible.
- 出版日期1992-8-31
