Abstract
An unusual peak has been found by Müller et al. for the attenuation of longitudinal sound as a function of temperature around 12 K for UPt3. Breathing mode coupling of the volume strain to the electronic energy states of a narrow band of high density at the fermi energy seems to be the origin of this peak.
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References
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Schotte, K.D., Förster, D. & Schotte, U. Can ultrasonic sound attenuation measurements elucidate the coupling of “Heavy electrons” to the lattice?. Z. Physik B - Condensed Matter 64, 165–168 (1986). https://doi.org/10.1007/BF01303698
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DOI: https://doi.org/10.1007/BF01303698