Regensburg 2007 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 11: Poster Session

DF 11.9: Poster

Donnerstag, 29. März 2007, 14:30–18:00, Poster C

Time Dependence of Electric Field-Induced Structural Phase Transitions in the Near-Surface Region of Strontium Titanate at Room Temperature — •Hartmut Stöcker, Stephan Ritter, Alexandr A. Levin, and Dirk C. Meyer — Institut für Strukturphysik, 01062 Dresden

Time dependence of electric current and an almost completely reversible structural change of near-electrode regions of an (001) SrTiO3 (STO) single-crystal plate in an external electrical field [1] have been investigated. Changes of the crystal structure remaining after cyclic processing are discussed in terms of a memory effect. The time dependence of the current is compared with temporal change of the structure of STO at near-surface regions as observed by means of X-ray diffraction. The interplay of charge carrier transport and structural evolution allows to interpret the structural transition as solid-state electrolysis and also to characterize the transformed crystal from the point of view of its electrical properties.

[1] D. C. Meyer, A. A. Levin, T. Leisegang, E. Gutmann, P. Paufler, M. Reibold, W. Pompe, Appl. Phys. A 84 (1-2), 31-35 (2006)