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

Abstract

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 $T_c/30$ clearly indicates the presence of nodes in the gap. In the normal state, we find an enormous anisotropy of $\alpha$ in the basal plane of the tetragonal structure. In the superconducting state, the temperature dependence of $\alpha$ also exhibits significant anisotropy. We discuss these results in relation to possible gap functions.

4 pages, 3 figures. Interpretation of data clarified. Accepted for publication in PRL

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