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Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 44: Postersession II

DS 44.39: Poster

Donnerstag, 23. März 2017, 17:00–19:00, P1C

Study of manganites with Resonant X-ray Reflectivity — •Michael Dettbarn1, Volodymyr B. Zabolotnyy1, Abdul-Vakhab Tcakaev1, Benjamin Katter1, Jorge Enrique Hamann-Borrero2, Kirill Miller1, Michael Zapf1, Andreas Herklotz3, Diana Rata4, Enrico Schierle5, Feizhou He6, Ronny Sutarto6, Kathrin Dörr4, Jochen Geck7, George A. Sawatzky8, Michael Sing1, Ralph Claessen1, and Vladimir Hinkov11Universität Würzburg and Röntgen Center for Complex Material Systems (RCCM), Würzburg — 2IFW, Dresden — 3ORNL, Oak Ridge, USA — 4Martin-Luther-Universität Halle-Wittenberg, Halle — 5HZB, Berlin — 6CLS, Saskatoon, Canada — 7TU Dresden, Dresden — 8UBC, Vancouver, Canada

Perovskite manganites such as LaMnO3 are known to reveal a non-trivial behavior of the manganese L-edge resonant absorption, due to a complicated interplay between Hund’s first rule, spin-orbit coupling and crystal field splitting. Using Resonant X-ray Reflectivity (RXR), together with cluster calculations, we study the optical properties of LaMnO3 and Pr0.5Ca0.5MnO3 samples. We are investigating the resonant behavior of the Mn ions depending on varying mechanisms such as doping, oxygen stoichiometry overshoots and distortions of the MnO6 octahedra, the latter being induced by either the Jahn-Teller effect or epitaxial strain. The layer-resolved nature of RXR enables us to derive the separate concentrations of the Mn valencies, which allows for different conclusions about interfacial correlation effects in the presence of orbital and magnetic ordering.

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