TY - JOUR
T1 - New photorefractive mechanism in centrosymmetric crystals
T2 - A strain-coordinated Jahn-Teller relaxation
AU - Hofmeister, Rudolf
AU - Yariv, Amnon
AU - Yagi, Shogo
AU - Agranat, Aharon
PY - 1992
Y1 - 1992
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=5244306256&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.69.1459
DO - 10.1103/PhysRevLett.69.1459
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AN - SCOPUS:5244306256
SN - 0031-9007
VL - 69
SP - 1459
EP - 1462
JO - Physical Review Letters
JF - Physical Review Letters
IS - 9
ER -