Optical Response of Sr${}_2$RuO${}_4$ Reveals Universal Fermi-liquid Scaling and Quasiparticles Beyond Landau Theory

D. Stricker, J. Mravlje, C. Berthod +4

We report optical measurements demonstrating that the low-energy relaxation rate ($1/\tau$) of the conduction electrons in Sr${}_2$RuO${}_4$ obeys scaling relations for its frequency ($\omega$…