Effect of the cooling speed through Tc on the formation of textures in superfluid 3He-A

The cw-NMR measurements have been performed for superfluid 3He A-phase in a single cylinder with 115 μm inner radius. We observed two peaks in NMR spectra, the main peak and the satellite peak. The satellite peak is attributed to textures which are induced by the flow due to temperature gradient by controlling the cooling speed of samples from normal fluid state to superfluid A-phase. We have observed that the satellite peak height of NMR spectrum increases continuously as the cooling speed increases. The number of possible texture types is restricted for our cylindrical cell, since the radius of the cell is about ten times larger than the dipole coherence length ξd ∼ 10 μm. Therefore, it is unlikely that the continuous change of NMR spectrum is attributed to the different kinds of textures. We discuss that these results are due to textural domain structure along cylindrical axis.