Ultrafast dynamics in CeTe3 near the pressure-induced charge-density-wave transition


Ultrafast dynamics in CeTe3 near the pressure-induced charge-density-wave transition

Tauch, J.; Schäfer, H.; Obergfell, M.; Demsar, J.; Giraldo, P.; Fisher, I. R.; Pashkin, A.

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.

Keywords: Correlated Electrons; Nonequilibrium Quantum Many-Body Systems

  • Lecture (Conference)
    DPG Spring Meeting 2015 (Berlin), 16.-20.03.2015, Berlin, Germany

Permalink: https://www.hzdr.de/publications/Publ-22866
Publ.-Id: 22866