Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 33: CE: Metal-Insulator Transition 1
TT 33.5: Vortrag
Mittwoch, 16. März 2011, 11:30–11:45, HSZ 105
Charge-dynamics in Pr-doped La,Sr-bilayer manganites with 40% hole doping — •Jan Thöne, Torben Hänke, Volodymyr Zabolotnyy, Mircae Apostu, Klaus Koepernik, Sergei Borisenko, Bernd Büchner, and Jochen Geck — Leibnitz Institute for Solid State and Materials Research Dresden
To analyse the charge dynamics of La,Sr-bilayer manganites we performed angle resolved photoemission measurements on (La1−xPrx)1.2Sr1.8Mn2O7 single crystals. The spectra are compared to a tight-binding Wannier model. The measured bilayer splitting is much smaller than the calculated one, indicating a strongly reduced hybridization between the bilayer-planes in the real material. Further the spectral function exhibits fingerprints of a periodic perturbation with an interaction strength of around 400 meV. A possible origin of such a perturbation are CE-type charge-order fluctuations.