Abstract
We report measurements of the attenuation and velocity of longitudinal sound waves with the wave-vector parallel to the a-axis in the heavy electron superconductor URu 2Si 2. In the superconducting state the attenuation shows an absorption peak at 0.8 K considerably below T c=1.05 K. Associated with it an anomalously large decrease in the sound velocity is also observed. We also report sound velocity measurements in the normal state and compare it to results expected from the theory of a pinned density wave.
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