| Autor: |
Ostermeier, R. M., Glaberson, W. I. |
| Zdroj: |
Journal of Low Temperature Physics; November 1976, Vol. 25 Issue: 3-4 p317-351, 35p |
| Abstrakt: |
We present measurements of the mobility of positive and negative ions trapped on vortex lines in pure4He and dilute3He-4He solutions over the temperature range 1.6>T>0.3 K. In pure4He below about 0.7 K, we observe several new effects not seen at higher temperatures and not easily explained with existing theories. Most notable are an enhanced broadening of the ion pulse and a rapid increase in the mobility with decreasing temperature. Measurements of the electric field dependence of the drift velocity in pure4He at low temperatures show a limiting velocity for sufficiently large fields. This behavior can be explained using a simple resonance theory. The inverse mobility data for solutions show sharp increases at certain critical temperatures, which are interpreted as being associated with the condensation of3He atoms onto the vortex cores. The dependence of the critical temperature on the bulk3He concentration is found to be in good agreement with a simple condensation theory. An extension of arguments used in this theory to lower temperatures leads to the picture of a3He-rich core growing with decreasing temperature, consistent with our lower temperature experimental data. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
Full text from SpringerLink