DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2012 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

DF: Fachverband Dielektrische Festkörper

DF 13: Poster II

DF 13.20: Poster

Wednesday, March 28, 2012, 15:00–17:30, Poster E

Light-induced absorption spectroscopy in niobate, titanate and borate crystals — •Andreas Buescher1, Hauke Bruening1, Bettina Schoke1, Christoph Merschjann2, Stefan Torbruegge1, Gabor Corradi3, Susanne Hoffmann-Eifert4, and Mirco Imlau11Department of Physics, University of Osnabrück, Germany — 2Helmholtz-Zentrum für Materialien und Energie, Berlin, Germany — 3Research Institute for Solid State Physics and Optics, Budapest, Hungary — 4Institut für elektronische Materialien, Forschungszentrum Jülich, Germany

Light-induced absorption spectroscopy (LIAS) is a powerful tool for investigation of wide bandgap oxide materials. In this contribution, we will review the results in the niobates LiNbO3 and KNbO3 as well as in SrTiO3 and β-BaB2O4. In LiNbO3, we study the complex interplay of two-photon excitation of small hole and bound polarons and the optical gating of bipolarons into free and bound polarons. In KNbO3, we deal with one electron and one hole polaron allowing for the development of a new model for thermally activated polaron hopping giving access to new microscopic parameters. SrTiO3, widely discussed as a memristor material, is studied using LIAS to get insight into the charge transport properties of this material taking into account the model of extended defects. In β-BaB2O4 polarons are discussed as the origin of laser damage. We face the problem as a result of the high photon-flux showing the limitations of this measurement technique.

Financial support by the DFG (IM37/5 and INST190/137-1) and DAAD (50445542) is gratefully acknowledged.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2012 > Berlin