Photorefractive Measurement Of Anisotropy Of The Mobility Of Photo-Excited Holes In BaTiO   3

Tzou, C. P.; Chang, Tallis Y.; Hellwarth, R. W.

doi:10.1117/12.960385

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1997

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Cited by 17 publications

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“…where the subscripts a, b, and c denote the axes along which the mobility is considered. In contrast to previous studies [1,11] where only two extremal points were measured, we determine the full dependence of the decay times t of the spacecharge grating on the angle q between k g and the c axis. We choose a very large grating period of 45 mm (k g 0.14 mm 21 ) in order to neglect the terms in the parentheses on the right hand side of Eq.…”

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confidence: 99%

Anisotropy of the Electron and Hole Drift Mobility inKNbO3andBaTiO3

Bernasconi¹,

Biaggio²,

Zgonik³

et al. 1997

Phys. Rev. Lett.

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We determine the anisotropy of the mobility of photoexcited charge carriers in single crystals of KNbO 3 and BaTiO 3 by means of a purely optical method. In orthorhombic KNbO 3 the mobility anisotropy is measured for both electrons and holes giving m a ͞m c 1.05 6 0.06, m b ͞m c 2.9 6 0.3 for holes and m a ͞m c 1.15 6 0.09, m b ͞m c 1.9 6 0.2 for electrons. In BaTiO 3 we find for holes m a ͞m c 19.6 6 0.6. Our experiment also demonstrates that the acoustic phonon contribution to the dielectric permittivity is substantially different for spatially modulated electric fields as compared to the homogeneous case.

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confidence: 99%