Magnetism versus superconductivity—molecular-field theory

Within the context of molecular-field theory we analyze the thermodynamics of magnetic superconductors over the whole ($T$,$H$) plane. The conditions for the coexistence of a long-range magnetic order (including ferromagnetic order) and superconductivity are given. Specific heat and static susceptibility are calculated and anomalies associated with the occurrence of a coexistence phase are observed. Good qualitative agreement with experiments is found and several predictions are made.