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Breakdown of the Wiedemann-Franz law at the Lifshitz point of strained <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">RuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>
Strain tuning ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}$ through the Lifshitz point, where the Van Hove singularity of the electronic spectrum crosses the Fermi energy, is expected to cause a change in the temperature dependence of the electrical resistivity from its Fermi liquid behavior $\ensuremath{\rho}\ensuremath{\sim}{T}^{2}$ to $\ensuremath{\rho}\ensuremath{\sim}{T}^{2}\mathrm{log}(1/T)$, a behavior consistent with experiments by Barber et …