Tuning the Fermi Liquid Crossover in Sr$_2$RuO$_4$ with Uniaxial Stress

cond-mat.str-el

/ Authors

Aaron Chronister, Manuel Zingl, Andrej Pustogow, Yongkang Luo, Dmitry Sokolov, Naoki Kikugawa, Clifford Hicks, Fabian Jerzembeck, Jernei Mravlje, Eric Bauer

and 3 more authors

Andrew Mackenzie, Antoine Georges, Stuart Brown

/ Abstract

We perform nuclear magnetic resonance (NMR) measurements of the oxygen-17 Knight shifts for Sr$_2$RuO$_4$, while subjected to uniaxial stress applied along [100] direction. The resulting strain is associated with a strong variation of the temperature and magnetic field dependence of the inferred magnetic response. A quasi-particle description based on density-functional theory calculations, supplemented by many-body renormalizations, is found to reproduce our experimental results, and highlights the key role of a van-Hove singularity. The Fermi liquid coherence scale is shown to be tunable by strain, and driven to low values as the associated Lifshitz transition is approached.