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Ultrasonic attenuation and sound velocity in UPt3
Abstract
The authors report measurements of the ultrasonic attenuation and sound velocity through the superconducting transition of UPt//3. The attenuation varies as T**2 at low temperatures and is inconsistent with the identification of UPt//3 as a singlet superconductor. Below T//c the sound velocity varies roughly as T**3 and above T//c as T**2. The results indicate that UPt//3 is an anisotropic (triplet) superconductor in a polar-like state.
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