ISSN:
1573-7357
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract We report the results of an NMR imaging study of3He-4He mixture crystals in coexistence with the liquid. Data were obtained for 7 different3He concentrations between 0.7% and 12.12%, in the temperature range between 0.45 K and 1.3 K, along the melting curve. We imaged the spatial distribution of the density3He, and that ofT 1, andT 2 relaxation times in the solid and in the liquid along the vertical direction of the experimental cell, perpendicular to the solid-liquid interface. We find significant differences between the dynamics of3He atoms in hep and bcc solid phases. These can be attributed to the different properties of thermally activated vacancies in the two phases. Specifically, in the bcc phase above 1 K, vacancy induced motion of3He atoms in the solid is faster than the motion in the liquid. We interpret this finding in terms of a3He-vacancy bound state. Finally, we examine our results within the broader context of finding a consistent description of the properties of vacancies in solid He.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00755975
Permalink
