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Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 27: CE: Poster Session

TT 27.35: Poster

Wednesday, March 24, 2010, 14:00–18:00, Poster D1

Temperature dependent optical conductivity of RVO3 (R=Y, Gd), LaSrFeO4 and RCoO3 (R=La, Eu) studied by ellipsometry — •Julia Küppersbusch1, Kostiantyn Shportko1, Agung Nugroho2, Thomas Palstra2, Navid Qureshi1, Marco Reuther1, Thomas Lorenz1, and Markus Grüninger11Universität zu Köln — 2Rijksuniversiteit Groningen

Spin and orbital degrees of freedom play a decisive role in strongly correlated transition-metal oxides. Spin and orbital correlations for instance have a strong impact on the optical transitions from the lower to the upper Hubbard band. Our aim is a systematical study to understand the importance of spin/orbital correlations and also excitonic effects on the temperature dependence of the optical spectra. We use ellipsometry from 0.75 to 5.5 eV and show results on RVO3, LaSrFeO4, and RCoO3.
The 3d5 configuration of LaSrFeO4 does not show orbital degrees of freedom, the spins order at 350 K, thus the behavior at lower temperatures offers a reference for the influence of the lattice. The T dependence of the optical data of 3d2 RVO3 can be well described on the basis of spin/orbital correlations. The 3d6 compounds RCoO3 allow to study the effect of a spin-state transition on the optical data.

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