Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: CE: Metal-Insulator Transition 2

TT 19.2: Vortrag

Mittwoch, 24. März 2010, 09:45–10:00, H18

Comparison of EELS and RIXS measurements for the single layer manganite La_1−xSr_1+xMnO₄ — •Roberto Kraus¹, Jochen Geck¹, Matthias Schrade¹, Martin Knupfer¹, Bernd Büchner¹, and Pieter Glatzel² — ¹IFW Dresden, Germany — ²ESRF Grenoble, France

The manganites show a variety of magnetic and electronic phases which are connected to charge, spin and orbital degrees of freedom. One example is the single layered perovskite La_1−xSr_1+xMnO₄. Upon hole doping new in-gap excitations appear and up to now it is unclear if they are of charge-transfer or Mott-Hubbard type. To characterize the excitations in the system, we performed electron energy-loss spectroscopy (EELS) and resonant inelastic X-ray scattering (RIXS) of the Mn K-edge. The observed in-gap excitation shows a small positive dispersion and a clear positive shift as a function of temperature in the half-doped sample.