Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 24: Postersitzung III: Korrelierte Elektronen, ”Orbital Physics”

TT 24.37: Poster

Mittwoch, 10. März 2004, 14:30–19:00, Poster A

Transport Properties of LaTiO_3+x Films and Heterostructures — •Andreas Schmehl¹, Frank Lichtenberg¹, Darrell Schlom², Hartmut Bielefeldt¹, and Jochen Mannhart¹ — ¹Experimentalphysik VI, Elektronische Korrelationen und Magnetismus, Institut für Physik, Universität Augsburg, Universitätsstr. 1, D-86135 Augsburg, Deutschland — ²Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802-5505, USA

We report on the transport properties of LaTiO_3+δ and LaTiO_3.5 films. The LaTiO_3+δ samples show metallic transport and several samples exhibit a hysteretic drop of resistance during cooldown at ∼240 K. The ferroelectric LaTiO_3.5 samples, grown in capacitor structures, have nonlinear, diode-like and hysteretic V(I)-characteristics. Two charge-controlled transport regimes are found, which can be utilized for switching the devices between two voltage states.