Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 27: CE: Poster Session
TT 27.5: Poster
Mittwoch, 24. März 2010, 14:00–18:00, Poster D1
EELS-study of La1−xSr1+xMnO4 — •Matthias Schrade, Roberto Kraus, Pascal Reutler, Jochen Geck, Martin Knupfer, and Bernd Büchner — Institute for Solid State Research, IFW Dresden
The layered manganite La1−xSr1+xMnO4 displays a strong interplay of charge-, spin-, and orbital degrees of freedom, which results in complex electronic properties.
We performed a detailed electron energy loss spectroscopy (EELS) study in order to clarify the charge dynamics in these materials as a function of doping and temperature.
A new feature at 1.8 eV rapidly gains spectral weight with increasing x. This low energy excitation shows little dispersion, but for x > 0.25 an additional excitation appears around 1 eV for high q-values.
At low T, the magnetic superstructure for half doping could be observed, coinciding with a 0.3 eV-shift of the 1.8 eV-excitation. An interpretation of the physical origin of the different excitations will be proposed.