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Regensburg 2010 – scientific programme

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KR: Fachverband Kristallographie

KR 10: Poster: Multiferroics (with MA, DF, KR, DS)

KR 10.74: Poster

Tuesday, March 23, 2010, 10:45–13:45, Poster A

Large photoconductivity of La0.7Ca0.3MnO3−δ/SrTiO3 heterostructures — •Elke Beyreuther1, Andreas Thiessen1, Stefan Grafström1, Kathrin Dörr2, and Lukas M. Eng11Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden — 2Institut für Metallische Werkstoffe, IFW Dresden, D-01171 Dresden

The electric resistivity of stoichiometric and oxygen-deficient epitaxial 10-nm-thick La0.7Ca0.3MnO3 thin films on SrTiO3 under photoexcitation has been investigated systematically. In contrast to the as-prepared film, the oxygen-deficient one exhibits a pronounced photoinduced decrease of the resistivity of up to five orders of magnitude at low temperatures.

A detailed analysis of the resistivity as a function of illumination intensity and wavelength (visible to ultraviolet range) is presented for the bare substrate as well as for the film/substrate heterostructure. The roles of carrier generation in the film and carrier injection from the substrate, which both contribute to the observed effects, are discussed.

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