Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 22: Low-Dimensional Systems: Charge Order
TT 22.3: Vortrag
Montag, 31. März 2014, 15:30–15:45, BEY 81
Influence of Doping on the Phonon Softening in the CDW Systems NbSe2 and TiSe2 — •Roland Hott1, Rolf Heid1, Klaus-Peter Bohnen1, Frank Weber1,2, Stephan Rosenkranz2, John-Paul Castellan1,2, and Dmitry Reznik1,3 — 1Karlsruhe Institute of Technology, Institute of Solid State Physics, P. B. 3640, D-76021 Karlsruhe, Germany — 2Materials Science Division, Argonne National Laboratory, Argonne, Illinois, 60439, USA — 3Department of Physics, University of Colorado at Boulder, Boulder, Colorado, 80309, USA
We studied the influence of doping on the soft-mode behaviour of phonons in the Charge Density Wave (CDW) systems NbSe2 and TiSe2 both experimentally by means of high resolution Inelastic X-ray Scattering (IXS) and theoretically in Density Functional Theory (DFT) based ab-initio phonon calculations. In agreement with our experiments on Cu-doped TiSe2 and Co-doped NbSe2 our calculations show that doping weakens the tendency towards the CDW instability.
F. Weber et al., Phys. Rev. B 87 (2013) 245111
F. Weber et al.,
Phys. Rev. Lett. 107 (2011) 266401.