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

Abstract

We perform nuclear magnetic resonance (NMR) measurements of the oxygen-17 Knight shifts for Sr2RuO4 , 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.

Controlling frustrated magnetism on the kagome lattice by uniaxial-strain tuning

“…The compression was monitored in situ by the built-in capacitive displacement sensor. Similar to previous strain studies [61,62], the applied strain ε was calculated as the displacement divided by the length of the sample surface that remained free of epoxy -for sample s2 this corresponds to 0.6 mm (Fig. 5a-c).…”