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Tuning the Fermi Liquid Crossover in Sr₂RuO₄ with Uniaxial Stress

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arxiv 2111.05570 v2 pith:GTIPLDE4 submitted 2021-11-10 cond-mat.str-el

Tuning the Fermi Liquid Crossover in Sr₂RuO₄ with Uniaxial Stress

Aaron Chronister , Manuel Zingl , Andrej Pustogow , Yongkang Luo , Dmitry Sokolov , Naoki Kikugawa , Clifford Hicks , Fabian Jerzembeck
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Jernei Mravlje Eric Bauer Andrew Mackenzie Antoine Georges Stuart Brown
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classification cond-mat.str-el
keywords magneticassociatedfermiliquidstrainstressuniaxialalong
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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.

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