Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 22: Low-Dimensional Systems: Charge Order

TT 22.3: Talk

Monday, March 31, 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 Weber^1,2, Stephan Rosenkranz², John-Paul Castellan^1,2, and Dmitry Reznik^1,3 — 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.