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Unrenormalized ultrasound attenuation in the heavy-fermion state
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https://doi.org/10.1103/physrevb.33.5906Abstract
Quantitative studies of ultrasound absorption in the heavy-fermion state of UPt3 and UBe13 are reported. The magnitude of the absorption due to electrons in the normal state is not enhanced compared to that of ordinary metals, indicating a cancellation of the mass enhancement by a reduction of the electron-phonon coupling parameter. This implies that the mass enhancement is described by a different Landau Fermi-liquid parameter than in He3. The T2 variation of the normal-state sound velocity at lowest temperatures is consistent with the large electronic specific heat.
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