Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 33: Postersession Correlated Electrons: Metal Insulator Transition, Spin Systems and Itinerant Magnets

TT 33.10: Poster

Mittwoch, 25. März 2009, 14:00–18:00, P1A

The coupled electronic order of manganese and oxygen states in doped manganites — •Jochen Geck^1,2, David G. Hawthorn³, Kyle M. Shen⁴, Hiroki Wadati², Enrico Schierle⁵, Liu H. Tjeng⁶, Hsueh-Hung Wu⁶, Christian Schüßler-Langeheine⁶, and George A. Sawatzky² — ¹IFW Dresden, Germany — ²University of British Columbia, Canada — ³University of Waterloo, Canada — ⁴Cornell University, USA — ⁵Helmholtz-Zentrum Berlin, Germany — ⁶University of Cologne, Germany

Comparing resonant soft x-ray scattering (RSXS) experiments and realistic many-body calculations, the nature of the electronic crystal formed in the low-temperature phase of La_7/8Sr_1/8MnO₃ is investigated. The analysis of the experimental data implies that the modulation of the Mn-valence must be very small and that the detected Mn-ordering is mainly of orbital nature. The emerging picture of manganese orbital order, which is coupled to charge and orbital order of the O 2p-states, seems to be a general feature of electronically ordered manganites.