Berlin 2012 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 6: Application of dielectric solids

DF 6.2: Vortrag

Montag, 26. März 2012, 17:10–17:30, EB 107

Time dependent properties of ferroelectric electron emission from PMN-PT single crystals — •Jana Becherer, Oliver Mieth, and Lukas M. Eng — Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden

We report on the electron emission properties of PMN-PT single crystals upon cyclic switching using a variety of different voltage shapes. An aperture in the top electrode allows electrons to exit from the ferroelectric solid into vacuum. The emission current was measured under UHV conditions using a single electron detector. We find that the emitted electron current strongly depends on both the duty cycle and repetition rate of the applied voltages. Comparative measurements of the polarization switching in the samples were performed. The polarization switching occurs over a broad distribution of time as is typical for relaxor PMN-PT. We found that the electron emission is strongly correlated with the amount of reversed polarization.