On the Coexistence Magnetism/Superconductivity in the Heavy-Fermion   Superconductor CePt$_3$Si
  The interplay between magnetism and superconductivity in the newly discovered heavy-fermion superconductor CePt$_3$Si has been investigated using the zero-field $\mu$SR technique. The $\mu$SR data indicate that the whole muon ensemble senses spontaneous internal fields in the magnetic phase, demonstrating that magnetism occurs in the whole sample volume. This points to a microscopic coexistence between magnetism and heavy-fermion superconductivity. 
A. Amato, E. Bauer, C. Baines