SKM 2023 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 14: Polar Oxide Crystals and Solid Solutions II

KFM 14.7: Vortrag

Donnerstag, 30. März 2023, 16:15–16:35, POT 106

Nonlinear diffuse fs-pulse reflectometry adopted to LNT solid solutions — •F. Kodde¹, L. Vittadello¹, J. Klenen¹, K. Koempe², V. Hreb³, D. Sugak³, V. Sydorchuk⁴, U. Yakhnevych⁵, and M. Imlau¹ — ¹Institute of Physics, Barbarastr. 7, Osnabrück University — ²Department of Biology and Chemistry, Barbarastr. 11, Osnabrück University — ³Department of Semiconductor Electronics, Bandery Str. 12, Lviv Polytechnic National University, 79013 Lviv, Ukraine — ⁴Institute for Sorption and Problems of Endoecology, NASU, 13 Gen. Naumov St., 03164 Kyiv, Ukraine — ⁵Institute of Energy Research and Physical Technologies, Am Stollen 19B, TU Clausthal

Nonlinear diffuse fs-pulse reflectometry is a powerful tool to analyze the spontaneous polarization of polar oxide nano-crystals [Kijatkin et al., Photonics 4, 11 (2017)]. It profits from the absence of a phase-matching condition for frequency conversion. We present our systematic investigations at the example of nanocrystals of LiNb_1−xTa_xO₃ (LNT) solid solutions [Vasylechko et al., Crystals 11, 755 (2021)], that show a disappearance of the birefringence if the temperature is precisely adjusted [Wood et al., J. Phys.: Condens. Mat. 20, 235237 (2008)]. Accordingly, we have extended the experimental setup by a temperature controlled pellet holder and determined the harmonic ratio as a function of composition, i.e. Li/Ta-ratio. We find both, a characteristic maximum of the harmonic ratio, and a dependence of the maximum on the composition. Financially supported by the DFG and BMBF [project IM 37/12-1, FOR5044, BMBF, FKZ: 01DK20009].