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APS » Journals » Phys. Rev. Lett. » Volume 86 » Issue 26
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Phys. Rev. Lett. 86, 5986–5989 (2001)

Ultrasound Attenuation in Sr2RuO4: An Angle-Resolved Study of the Superconducting Gap Function

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C. Lupien, W. A. MacFarlane, Cyril Proust, and Louis Taillefer
Canadian Institute for Advanced Research, Department of Physics, University of Toronto, Toronto, Canada M5S 1A7

Z. Q. Mao and Y. Maeno
Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan

Received 19 January 2001; published in the issue dated 25 June 2001

We present a study of the electronic ultrasound attenuation α in the unconventional superconductor Sr2RuO4. The power law behavior of α at temperatures down to Tc/30 clearly indicates the presence of nodes in the gap. In the normal state, we find an enormous anisotropy of α in the basal plane of the tetragonal structure. In the superconducting state, the temperature dependence of α also exhibits significant anisotropy. We discuss these results in relation to possible gap functions.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.5986
DOI:
10.1103/PhysRevLett.86.5986
PACS:
74.25.Ld, 74.20.Rp, 74.70.Pq
 
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