New photorefractive mechanism in centrosymmetric crystals: A strain-coordinated Jahn-Teller relaxation

Rudolf Hofmeister*, Amnon Yariv, Shogo Yagi, Aharon Agranat

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

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 p to 1.7×10-5 and photorefractive response at more than 120°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.

Original languageAmerican English
Pages (from-to)1459-1462
Number of pages4
JournalPhysical Review Letters
Volume69
Issue number9
DOIs
StatePublished - 1992

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