Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 33: Low-Dimensional Systems: Other Materials
TT 33.11: Talk
Tuesday, March 17, 2015, 12:15–12:30, H 3010
Ultrafast dynamics in CeTe3 near the pressure-induced charge-density-wave transition — Jonas Tauch1, Hanjo Schäfer1,2, Manuel Obergfell1, Jure Demsar1,2,3, Paula Giraldo4, Ian R. Fisher4, and •Alexej Pashkin1,5 — 1Department of Physics and Center for Applied Photonics, University of Konstanz, Germany — 2Institute of Physics, Ilmenau University of Technology, Germany — 3Institute of Physics, Johannes Gutenberg-University Mainz, Germany — 4Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, USA — 5Helmholtz-Zentrum Dresden-Rossendorf, Germany
Femtosecond pump-probe spectroscopy is an efficient tool for studying ultrafast dynamics in strongly correlated electronic systems, in particular, compounds with a charge-density-wave (CDW) order. Application of external pressure often leads to a suppression of a CDW state due to an impairment of the Fermi surface nesting.
We combine time-resolved optical spectroscopy and diamond anvil cell technology to study electron and lattice dynamics in tri-telluride compound CeTe3. Around pressures of 4 GPa we observe a gradual vanishing of the relaxation process related to the recombination of the photoexcited quasiparticles. The coherent oscillations of the phonon modes coupled to the CDW order parameter demonstrate even more dramatic suppression with increasing pressure. These observations clearly indicate a transition into the metallic state of CeTe3 induced by the external pressure.