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Observation of a collective mode in superconducting UBe13.


Sound propagation in the heavy-fermion superconductor UBe13 is studied at frequencies from 0.9 to 2.4 GHz and temperatures from 0.01 to 100 K. A peak in the acoustic attenuation is observed below the superconducting transition of 0.9 K, instead of the rapid drop expected for a BCS superconductor. Absorption into a collective mode of a nonsinglet, anisotropic superconductor is proposed. © 1985 The American Physical Society.

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