Anisotropic spin diffusion in liquid 3He confined in nafen
V. V. Dmitriev+, L. A. Melnikovsky+, A. A. Senin+, A. A. Soldatov+*, A. N. Yudin+
+Kapitza Institute for Physical Problems of the RAS, 119334 Moscow, Russia
*Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
Abstract
We report results of spin diffusion measurements in normal phase of liquid
3He confined in nafen. Nafen is a new type of aerogel and it consists of
Al2O3 strands which are nearly parallel to one another at macroscopic
distances.
We examine two samples of nafen with different porosities using spin echo
techniques.
Spin diffusion of 3He along and across the strands was measured.
The aerogel alignment is clearly evident from observed spin diffusion
anisotropy.
A theory describing this effect is developed and compared with the
experiment.