Berlin 2005 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 16: Posters Correlated Electrons, Measuring Devices, Cryotechnique
TT 16.56: Poster
Samstag, 5. März 2005, 11:00–16:30, Poster TU C
Doping and pressure dependence of the optical properties of quasi-one-dimensional LaTiO3.4 — •C. A. Kuntscher1, K. Thirunavukkuarasu1, S. Frank1, I. Loa2, K. Syassen2, and F. Lichtenberg3 — 11. Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart, Germany — 2Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart, Germany — 3Experimentalphysik VI, EKM, Universität Augsburg, 86135 Augsburg, Germany
The perovskite-related compound LaTiO3.4 shows a quasi-one-dimensional metallic character, which can be explained by its crystal structure consisting of chains of TiO6 octahedra [1,2]. Based on temperature-dependent optical studies, a conduction mechanism involving polaronic quasiparticles was recently suggested [2]. To clarify the importance of polarons in LaTiO3.4 polarization-dependent infrared reflectivity measurements were carried out as a function of doping and pressure. Besides the conduction mechanism, the issues of pressure-induced dimensional crossover and pressure dependence of phonon modes will be discussed. Supported by the DFG, Emmy Noether-program.
[1] F. Lichtenberg et al., Prog. Solid State Chem. 29, 1 (2001).
[2] C. A. Kuntscher et al., Phys. Rev. B 67, 035105 (2003).