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Ultrasonic attenuation in UPt3

  • Author(s): Bishop, DJ
  • Varma, CM
  • Batlogg, B
  • Bucher, E
  • Fisk, Z
  • Smith, JL
  • et al.

We report measurements of the ultrasonic absorption in UPt3 through the superconducting transition. The attenuation varies as T2 at low temperature and is inconsistent with the identification of UPt3 as a singlet superconductor. Our results can be well explained by assuming that UPt3 is an anisotropic (triplet) superconductor in a polarlike state, where the gap vanishes along a line on the Fermi surface. © 1984 The American Physical Society.

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