Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 31: Correlated Electrons: Low-Dimensional Systems -Materials 1
TT 31.1: Vortrag
Dienstag, 12. März 2013, 09:30–09:45, H41
Charge density waves and lattice dynamics in 1T-TaS2 — •Tobias Ritschel1,5, Jan Trinckauf1, Gaston Garbarino2, Alexei Bosak2, Martin von Zimmermann3, Helmuth Berger4, Bernd Büchner1,5, and Jochen Geck1 — 1IFW Dresden — 2ESRF, Grenoble — 3HASYLAB, Hamburg — 4Ecole polytechnique Federale de Lausanne — 5TU Dresden
The layered compound 1T-TaS2 shows an interesting interplay of charge density wave (CDW) order and superconductivity. We studied the static CDW order by means of elastic X-ray diffraction as a function of temperature and external pressure, in order to shed light on the relation between these two collective electronic states. In addition, we investigated the pressure dependency of the lattice dynamics using inelastic X-ray scattering. The phonon dispersion around the CDW wave vector is strongly pressure dependent and a Kohn anomaly is observed well above the nearly commensurate to incommensurate phase transition temperature. We present the experimental data along with model calculations and discuss the results in relation to the pressure-induced superconductivity.