Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 25: Phase Transitions
O 25.6: Vortrag
Dienstag, 27. März 2007, 12:30–12:45, H41
Temperature Dependent Phase Transitions in 3d-Metal Intercalated Titanium Dichalcogenides — •Eike F Schwier1, Andreas Nuber1, Svetlana Titova2, Alexander Titov3, and Friedrich Reinert1 — 1Universität Würzburg, Experimentelle Physik II, 97094 Würzburg, Germany — 2Institute of Metallurgy, Urals Division of RAS, Russia — 3Institute of Metal Physics, Urals Division of RAS, Russia
To this day, it is not fully understood why certain titanium dichalcogenides show the presence of superstructures and others do not. By systematically intercalating these layered solids with electrons from 3d-metal atoms, we want to gain a deeper understanding of the electronical and structural processes within these compounds, that lead tonthe formation of superstructures and their supression.
Previous conductance measurements suggest a second order phase transition at 420 K for AgxTiTe2 (x = 0.65 - 0.74) and at 120 K for Mn0.145TiSe2. By angle-resolved UPS (He I and He II) and XPS (Al Kα) we investigated the influence of the phase transition to the electronic structure along the high-symmetry directions M’-Γ-M and Γ-K of the two materials and relate it to the band structure calculations, the conductance behavior of electronic structure and structural changes.