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%e report the first Knight-shift studies of the heavy-fermion superconducting state. In 5 kOe the Knight shift of muons in superconducting Ui "Th"Bei3 remains near the normal-state value for x =0. 033, but shows an unexpected strong decrease for x-0. If the pairing is of odd parity, this decrease suggests that the anisotropic order parameter is pinned to the lattice. The qualitatively different behavior for x=0.033 reflects either spin-orbit scattering by Th doping or a change of pairing symmetry.doi:10.1103/physrevlett.57.1255 pmid:10033397 fatcat:bcov3c6vkbgzrgt7hf5bnwsv4a