Ultrasound Attenuation in Sr${}_2$RuO${}_4$: an Angle-Resolved Study of the Superconducting Gap Function

C. Lupien, W. A. MacFarlane, Cyril Proust +3

We present a study of the electronic ultrasound attenuation $\alpha$ in the unconventional superconductor Sr${}_2$RuO${}_4$ . The power law behavior of $\alpha$ at temperatures down to $T_c/30$…