Observation of a low-temperature resonance peak in ultrasonic attenuation of
- 20 January 1986
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 56 (3), 248-251
- https://doi.org/10.1103/physrevlett.56.248
Abstract
We report measurements of the temperature dependence of the ultrasonic attenuation in normal-state . At about 12 K a pronounced longitudinal absorption peak is observed. Such a peak does not appear for transverse-acoustic waves. Our experimental results can be well explained by a narrow resonance in the quasiparticle excitation spectrum near the Fermi energy and are consistent with the enhanced specific-heat coefficient.
Keywords
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