NMR Studies of 3He Droplets in Dilute 3He-4He Solid Solutions

NMR Study of the Dynamics ofHe3Impurities in the Proposed Supersolid State of SolidHe4

“…The NMR echo amplitudes become temperature independent below the phase separation as expected for the formation of degenerate liquid 3 He droplets [17]. Our results for the phase separation temperatures are in good agreement with those reported by Toda et al for x 3 > 100 ppm [7].…”

“…2000 ppm) were also studied [8,17] and had temperature dependences similar to that of the 500 ppm sample except for the expected shift in the phase separation temperature. The position of the peak in T 1 corresponds closely to the saturation temperature T 90 observed for NCRIF at this x 3 [4].…”

NMR investigation of the low-temperature dynamics of solid4He doped with3He impurities

“…After phase separation, the relaxation times are observed to become temperature independent. 62,63 The observed relaxation times are consistent with a relaxation that occurs at the wall of degenerate Fermi liquid droplets. Huan et al 62 showed that the relaxation time was…”

Phase separation in dilute solutions ofHe3in solidHe4

“…In Fig. 4 we show the growth observed by Huan et al 15 following a drop in temperature of 100 mK into the metastable region of the phase diagram. Following a delay of about 1.1 h (attributed to nucleation) they observe a growth that is approximately exponential with a time constant of 2.4 ± 0.3 h (solid red line of Fig.…”

“…The phase transitions can be accurately determined from measurements of the NMR amplitudes. 15,20 Because of the small nuclear spin susceptibility of the degenerate Fermi liquid in the nearly pure 3 He droplets, one observes a sharp drop in the NMR amplitudes at the phase transition. This change in the NMR amplitudes is illustrated for several x 3 concentrations in Fig.…”