Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2010-08-10
Physics
Condensed Matter
Other Condensed Matter
12 pages, 15 figures, to appear in Physical Review B
Scientific paper
Systematic observations of the magnetically generated fountain pressure in the superfluid $^3$He A$_1$ have been carried out in a newly built apparatus designed to reduce the effect of thermal gradients. In the same apparatus, mechanical pumping and filtering of polarized nuclear spins were realized by the pneumatic pumping action of an electrostatically actuated membrane. In both experiments, the measured induced pressure was observed to decay at all temperatures where the A$_1$ phase appeared in magnetic fields up to 13 T and liquid pressures between 1 and 29 bar. The inferred spin relaxation rate tended to increase as the low temperature phase boundary with the A$_2$ phase (T$_{C2}$) was approached. The increase in spin relaxation rate near T$_{C2}$ can be explained by the presence of a minority spin condensate in the A$_1$ phase as predicted by Monien and Tewordt and by the application of the Leggett-Takagi theory of spin relaxation in superfluid $^3$He.
Aoki Yasumichi
Ishimoto Hidehiko
Kojima Hedeyasu
Suzuki Kaori
Yamaguchi Akinobu
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