Antiferromagnetic spin fluctuations and the heavy fermion system UPt(3).

We review the results of inelastic polarized and unpolarized magnetic neutron scattering measurements on the heavy fermion superconductor UPt(3). Below T(X) = 18K we find evidence for antiferromagnetic spin fluctuations with a modulation vector along the c-axis of the hexagonal lattice. This contradicts the analogy often made between UPt(3) and liquid (3)He, and may have important consequences for the pairing mechanism responsible for superconductivity in this system.