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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.92: Poster

Freitag, 4. April 2014, 10:30–13:30, P2

Photoresponse of La_0.7Ce_0.3MnO₃ films revisited – dominating role of the SrTiO₃ substrate — •Andreas Thiessen, Elke Beyreuther, and Lukas M. Eng — Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden, Germany

Cerium-doped LaMnO₃ films, which have been discussed as an electron-doped counterpart to the common hole-doped mixed-valence lanthanum manganites, were analysed regarding their manganese valence, conductivity and magnetoresistance under illumination. While oxygen-reduced La_0.7Ce_0.3MnO₃ films had shown a large photoconductivity effect as well as a light-induced recovery of the metal-insulator transition in the past [Beyreuther et al., PRB 80, 075106 (2009)], whose microscopic origins remained uncertain, the present study finds strong evidence for the determining role of the photoconductive SrTiO₃ substrate by the systematic investigation of a broad set of films with varied thickness, oxygen content, and degree of CeO₂ phase segregation.