MAGNETISM OF SUPERCONDUCTING UPT3

The phase diagram of superconducting UPt3 in the pressure-temperature plane, together with the neutron scattering data is studied within a t wo-component superconducting order parameter scenario, In order to giv e a qualitative explanation to the experimental data a set of two line arly independent antiferromagnetic moments which emerge appropriately at the temperatures T-N similar to 10T(c) and T-m similar to T-c and c ouple to superconductivity is proposed. Several constraints on the fou rth-order coefficients in the Ginzburg-Landau free energy are obtained .