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DF: Fachverband Dielektrische Festkörper

DF 9: Poster Session

DF 9.22: Poster

Dienstag, 21. März 2017, 14:00–16:00, P1C

Electrical current measurements at head-to-head domain walls in LiNbO₃ — •Manuel Becker and Elisabeth Soergel — University of Bonn, Bonn, Germany

Besides its pyroelectric, photorefractive, electrooptic and nonlinear optical properties, LiNbO₃ is observed to exhibit an enhanced electrical conductivity at certain domain wall configurations, although the crystal itself is an insulator. Especially head-to-head DWs show a significant conductivity which is related to a larger charge density compared to the bulk. The electrical currents at these DWs turn out to be in the order of several pA only, being difficult to detect by usual DC measurement techmiques. Therefore, low-noise AC current measurements using a lock-in amplifier are more suitable. By this means, DW currents are shown to be ohmic and an estimate for the resistance of a head-to-head DW is proposed.