부산대학교 도서관

We have measured the temperature and polarization dependence of Silin spin wave spectra in a saturated 3.sup.He-- 4.sup.He mixture with a concentration of 9.4% at a pressure of 8 bars. The mixture has been cooled and polarized by a Leiden dilution refrigerator to temperatures in the range 10--15 mK and polarizations as high as 9.2% corresponding to 3.4 times the equilibrium polarization of 2.7% in the external magnetic field of 11.36 T. The analysis takes into account the dipolar interactions and results in the relaxation time I .sub.aY= and spin diffusion constant D .sub.aY=. We find that I .sub.aY= and D .sub.aY= are proportional to 1/(T.sup.2+A.sup.2T.sub.a0.sup.2) where T is the temperature, A is the polarization enhancement factor and T .sub.a0 is the anisotropy temperature for the mixture at equilibrium in the external field. Our result T .sub.a0=3.66+-0.14 mK is 30% higher than the theoretical prediction for very dilute mixtures and is evidence for the existence of polarization induced relaxation of transverse spin currents.