Abstract
Aerogel is made of thin SiO2 strands of a few nanometer diameter. Since the coherence length of superfluid 3He is much longer than the silica strand diameter and is nearly the same as the mean distance between silica strands, aerogel gives us a chance to study the effects of an impurity in superfluid 3He. To investigate what superfluid states are formed in aerogel, we performed a pulsed NMR experiment. Both the A‐like and B‐like phases show a tipping angle dependent frequency shift in the FID signal after an rf pulse. The dependence in the A‐like phase is well explained by an expectation based on the “robust phase” introduced by Fomin, while the FID frequencies in the B‐like phase behave similarly to those observed in the bulk B phase in a slab geometry with the initial condition of a non‐Leggett configuration.
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