Light-Induced Polaronic Absorption at Low Temperature in Pure and (Fe, Ce, Cr) Doped Sr_xBa_1-xNb₂O₆ or Ba_1-yCa_yTiO₃ Crystals and Photodissociation of Vis Centers Into Small Polarons

S. E. KapphanFB Physik, University of Osnabrueck, Barbara Str. 7, 49069Osnabrueck, Germany;

I. KislovaFB Physik, University of Osnabrueck, Barbara Str. 7, 49069Osnabrueck, Germany;

M. WierschemFB Physik, University of Osnabrueck, Barbara Str. 7, 49069Osnabrueck, Germany;

T. LindemannFB Physik, University of Osnabrueck, Barbara Str. 7, 49069Osnabrueck, Germany;

M. GaoFB Physik, University of Osnabrueck, Barbara Str. 7, 49069Osnabrueck, Germany;

R. PankrathFB Physik, University of Osnabrueck, Barbara Str. 7, 49069Osnabrueck, Germany;

V. S. VikhninA. F. loffe, Phys.-Technical. Inst., RAS, 194021, St.-Petersburg, Russia

A. B. KutsenkoFB Physik, University of Osnabrueck, Barbara Str. 7, 49069Osnabrueck, Germany;

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Abstract

Congruent SBN and BCT crystals doped with Fe, Cr, Ce to enhance photorefractive properties, are investigated at low temperature (T > 1 K) under illumination with Ar^☎- and Kr^☎-laser light. Light-induced absorption changes in a wide spectral range from UV to IR indicate photoinduced charge transfer processes from impurities to polaronic centers. Broad NIR absorptions (at about 0,7 eV) associated with Ti^3☎ polarons in BCT or with Nb^4☎ polarons in SBN are observed and their non-linear behaviour with illumination intensity, polarization and temperature is described on the basis of the simple model for the photo charge transport (in SBN: Ce^3☎☎ Nb^5☎↔Ce^4☎☎Nb^4☎). A broad visible absorption VIS (at about 2 eV) appearing together with the NIR polarons, is shown by photodissociation (with a Kr^☎-laser) to consist at least partly of small polarons (in BCT and SBN).

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Light-Induced Polaronic Absorption at Low Temperature in Pure and (Fe, Ce, Cr) Doped Sr_xBa_1-xNb₂O₆ or Ba_1-yCa_yTiO₃ Crystals and Photodissociation of Vis Centers Into Small Polarons

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Light-Induced Polaronic Absorption at Low Temperature in Pure and (Fe, Ce, Cr) Doped SrxBa1-xNb2O6 or Ba1-yCayTiO3 Crystals and Photodissociation of Vis Centers Into Small Polarons

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Light-Induced Polaronic Absorption at Low Temperature in Pure and (Fe, Ce, Cr) Doped Sr_xBa_1-xNb₂O₆ or Ba_1-yCa_yTiO₃ Crystals and Photodissociation of Vis Centers Into Small Polarons