Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 26, Pages 5986-5989Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.5986
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We present a study of the electronic ultrasound attenuation ct in the unconventional superconductor Sr2RuO4. The power law behavior of cu 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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