Berlin 2024 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 16: Poster Ia

MM 16.5: Poster

Monday, March 18, 2024, 18:30–20:30, Poster E

Investigating changes of chemical bonding upon charge density wave transition in CuTe — •Johannes Holters, Christian Stenz, and Matthias Wuttig — Institute of Physics IA, RWTH Aachen University, 52074 Aachen, Germany

Properties of solids like the electrical conductivity, band gap, phonon dispersion and dielectric function are governed by the chemical bonds between the atoms. Changes in the bonding is thus indirectly measurable by electrical and optical means. The metallic mineral CuTe exhibits a Peierls-like distortion along tellurium chains below the transition temperature of 62°C. Due to the distortion the overlap of the Cu d-orbitals and Te p-orbitals is reduced, which leads to the occurence of a quasi-1D charge density wave. This work analyses the temperature-induced structural change of polycrystalline CuTe produced by sputter deposition by electrical and optical measurements. The electrical conductivity, phonon softening and dielectric function is used to investigate changes in the chemical bonding as a consequence of the electronic rearrangement along the Te-chains.

Keywords: Charge density wave; CuTe