| Numéro |
J. Phys. Colloques
Volume 42, Numéro C5, Octobre 1981
ICIFUAS-7Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids |
|
|---|---|---|
| Page(s) | C5-1097 - C5-1102 | |
| DOI | https://doi.org/10.1051/jphyscol:19815170 | |
ICIFUAS-7
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-1097-C5-1102
DOI: 10.1051/jphyscol:19815170
1 Department of Physics, University of Trondheim, The Norwegian Institute of Technology, 7034 NTH, Trondheim, Norway
2 Electronics Research Laboratory, University of Trondheim, The Norwegian Institute of Technology, 7034 NTH, Trondheim, Norway
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-1097-C5-1102
DOI: 10.1051/jphyscol:19815170
DYNAMIC CRITICAL BEHAVIOUR IN SOUND PROPAGATION
R.M. Holt1, 2, K. Fossheim1 et J.O. Fossum11 Department of Physics, University of Trondheim, The Norwegian Institute of Technology, 7034 NTH, Trondheim, Norway
2 Electronics Research Laboratory, University of Trondheim, The Norwegian Institute of Technology, 7034 NTH, Trondheim, Norway
Abstract
Results of ultrasonic experiments near the 187K structural transition in KMnF3 are discussed. For the hydrodynamic regime (ωτ<<1) the behaviour both in attenuation and sound velocity measurements is found to be in accord with predictions for the 3-dimensional Heisenberg model. A dynamic scaling function and the lifetime of ordered clusters are determined from measurements above Tc.