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A. Chronister, M. Zingl, A. Pustogow, Y. Luo, Y. Su, A. Mackenzie, C. Hicks, E. Bauer, N. Kikugawa, J. Mravlje, A. Georges, S. Brown:
"Van Hove singularity and stress-induced Fermi surface tuning in Sr2RuO4";
Vortrag: APS March Meeting 2021, online; 15.03.2021 - 19.03.2021.

Application of in-plane uniaxial stress to the quasi-2D correlated material Sr2RuO4 results in pronounced changes to the physical properties; most widely recognized is a factor 2.5 increase in superconducting transition temperature. The normal state is also significantly impacted. Reported here are 17-O NMR hyperfine shifts over a wide range of stress, field, and temperature. Results are compared to renormalized 3-band Wannier models constructed from DFT calculations. The crossover temperature to standard Fermi Liquid properties is observed to be tuned continuously from TFL=30 K to 0 K with applied stress. Furthermore, the combination of correlations and the stress-controlled proximity of E_F to a van Hove singularity are the main factors in determining the normal state properties for temperatures of order 300 K and below.