Pinning of Texture and Vortices of the RotatingB-like Phase of SuperfluidHe3Confined in a 98% Aerogel

M. Yamashita, A. Matsubara, R. Ishiguro, Y. Sasaki, Y. Kataoka, M. Kubota, O. Ishikawa, Yu. M. Bunkov, T. Ohmi, T. Takagi, T. Mizusaki
2005 Physical Review Letters  
We have investigated pinning effects on texture and vortices of the B-like phase of superfluid 3 He in a rotating aerogel up to 2 rad=s by cw-NMR. We observed deformation of the NMR spectra in rotation, due to counterflow between the superflow and the normal flow. The average intensity of the counterflow was calculated from the change of NMR spectra. The rotation dependence of the counterflow intensity is similar to the magnetization curve of hard type II superconductors or the counterflow
more » ... he counterflow response of 4 He-II in packed powders. This counterflow behavior is in qualitative agreement with a model that vortices are pinned unless the counterflow exceeds a critical velocity v c . The temperature independence of v c suggests that v c is associated with the expansion of primordial vortices.
doi:10.1103/physrevlett.94.075301 pmid:15783823 fatcat:4vu5q7i3mncgflcmi2prxym5xu