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

Rudolf Hofmeister, Amnon Yariv, Shogo Yagi, and Aharon Agranat
Phys. Rev. Lett. 69, 1459 – Published 31 August 1992; Erratum Phys. Rev. Lett. 72, 435 (1994)
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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 1.7×105 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.

  • Received 19 March 1992

DOI:https://doi.org/10.1103/PhysRevLett.69.1459

©1992 American Physical Society

Erratum

New Photorefractive Mechanism in Centrosymmetric Crystals: A Strain-Coordinated Jahn-Teller Relaxation

Rudolf Hofmeister, Amnon Yariv, Shogo Yagi, and Aharon Agranat
Phys. Rev. Lett. 72, 435 (1994)

Authors & Affiliations

Rudolf Hofmeister, Amnon Yariv, and Shogo Yagi

  • California Institute of Technology, Pasadena, California 91125

Aharon Agranat

  • Hebrew University of Jerusalem, Jerusalem, Israel

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Issue

Vol. 69, Iss. 9 — 31 August 1992

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