| Numéro |
J. Phys. Colloques
Volume 42, Numéro C5, Octobre 1981
ICIFUAS-7Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids |
|
|---|---|---|
| Page(s) | C5-695 - C5-700 | |
| DOI | https://doi.org/10.1051/jphyscol:19815107 | |
ICIFUAS-7
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-695-C5-700
DOI: 10.1051/jphyscol:19815107
1 II. Phys. Institut and Institut für Metallkunde und Metallphysik der RVTH Aachen und Sonderforsehungsbereich 125, Aachen - Jülich - Köln, F.R.G.
2 Institut für Metallkunde und Metallphysik der RWTH Aachen und Sonderforsehungsbereich 125, Aachen - Jülich - Köln, F.R.G.
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-695-C5-700
DOI: 10.1051/jphyscol:19815107
ULTRASONIC ATTENUATION AND SOUND VELOCITY ANOMALIES BELOW 5 K IN LaAl2
S. Ewert1, A. Hof1, D. Lenz2 et H. Schmid21 II. Phys. Institut and Institut für Metallkunde und Metallphysik der RVTH Aachen und Sonderforsehungsbereich 125, Aachen - Jülich - Köln, F.R.G.
2 Institut für Metallkunde und Metallphysik der RWTH Aachen und Sonderforsehungsbereich 125, Aachen - Jülich - Köln, F.R.G.
Abstract
Anelastic anomalies in LaA12 and (La+0.23at%Gd)A12 below 10K have been studied by MHz attenuation and sound velocity in the normal- and superconducting state. Three anelastic processes involving different lattice defects have been identified. Two of them are shown to exhibit a strong dependence on the concentration of unpaired electrons. For one process this is due to changes in the electronic component of the resonance damping constant, for the other due to changes of the relaxation rate. The third process is tentatively attributed to trapped hydrogen.