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

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

2001-01-20

arxiv.org/abs/cond-mat/0101319v2

Physical Review Letters, 86 (2001) 5986.

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1103/PhysRevLett.86.5986

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.

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