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Regensburg 2010 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 10: Dielectric surfaces and interfaces

DF 10.2: Talk

Wednesday, March 24, 2010, 14:45–15:05, H11

Room temperature domain wall conductivity in Mg-doped lithium niobate — •Mathias Schröder, Alexander Haußmann, and Lukas M. Eng — Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden

Deposition routes for metallic and molecular nanowires on the 180 domain walls of lithium niobate through ferroelectric lithography are well established [1,2]. However, a detailed understanding of the underlying processes is still missing, which implies the necessity of further systematic studies of specific domain wall properties.

Here, we report on conductive-AFM (c-AFM) measurements on 5 mol% Mg-doped congruent LiNbO3 single crystals. We compare the c-AFM results with the domain distribution recorded by piezoresponse force microscopy (PFM). Surprisingly, we find an enhanced current density at room temperature and in air along the 180 domain walls under UV-illumination above the band gap of 4 eV. This domain wall conductivity was then studied as a function of wavelength and light intensity. Implications for ferroelectric lithography on LiNbO3 templates will be discussed.

[1] S.V. Kalinin et al., Nano Letters 2, 589 (2002).

[2] A. Haussmann et al., Nano Letters 9, 763 (2009).

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