DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2006 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

TT: Tiefe Temperaturen

TT 31: Correlated Electrons: Metal Insulator Transition - Part 2

TT 31.2: Vortrag

Donnerstag, 30. März 2006, 14:15–14:30, HSZ 301

Electronic structure of LaTiO3 and YTiO3 — •A. Gössling1, R. Rückamp1, H. Roth1, T. Lorenz1, A. Freimuth1, and M. Grüninger21II. Phys. Institute, University of Cologne, Germany — 2II. Phys. Institute, University of Aachen, Germany

In Mott-Hubbard insulators, excitations from the lower to the upper Hubbard bands give rise to an interesting multi-peak structure in the optical conductivity. The spectral weight of these features is very sensitive to magnetic and orbital correlations.

Using spectroscopic ellipsometry, we determined the optical conductivity σ between 0.8 and 6 eV of the Mott-Hubbard insulators YTiO3 and LaTiO3 as function of temperature. While the spectra of YTiO3 show a sizeable redistribution of spectral weight with temperature, those of LaTiO3 are almost temperature independent. In YTiO3 a strong anisotropy between σa,b and σc is observed, which we trace back to an orbitally-ordered ground state.

Supported by the DFG in SFB 608

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2006 > Dresden