Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 22: 2D Materials II: Electronic Structure (joint session O/TT)

O 22.7: Talk

Tuesday, March 19, 2024, 12:15–12:30, MA 005

Probing the anisotropic scattering model in ultrapure Delafossites — •Linus Holeschovsky, Carsten Putzke, and Philip Moll — Max-Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany

Anisotropic scattering models have been used to describe the strange metal phase of overdoped cuprates. They stem from the idea of two distinct, k-dependent live-times of quasi-particles. This description is one among many trying to explain the strange metal phase and remains highly debated. On the other hand, the ultrapure delafossite PdCoO2 and PtCoO2 show two distinct quantum coherence lengths that can be explained by two different scattering times. These delafossite are particularly interesting due to their extremely long mean free path and moderate electronic correlation. This gives access to underlying physical properties, which can be theoretically explained within well-established theoretical models.

In this study, angle-dependent magnetic oscillation is used to investigate the anisotropic scattering time in microstructured PdCoO2 and PtCoO2. Specifically, a two-axis rotator is used to probe the coherence peak of interlayer transport in different crystallographic directions, which is particularly sensitive to scattering times. The anisotropy and temperature dependence of the scattering time can therefore be mapped on the Fermi surface. In this talk, we emphasize how the relative simplicity and textbook-like behavior of the delafossite materials make them prime candidates to probe physical models otherwise difficult to verify but were proposed in more complex materials.

Keywords: Microstructure; Anisotropic scattering time; Delafossite metals; Boltzmann theory