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Muon Knight Shift in the Heavy-Fermion Superconductors U1-xThxBe13, x=0 and 0.033
Abstract
We report the first Knight-shift studies of the heavy-fermion superconducting state. In 5 kOe the Knight shift of muons in superconducting U1-xThxBe13 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. © 1986 The American Physical Society.
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