The coexistence of spin-density waves and superconductivity has been theoretically analyzed in a two-band model, a case for which the commonly used descriptions for the ternary rare-earth compounds and highly anisotropic organic solids are unapplicable. The phase diagram at T=0, the temperature dependence of the order parameters, and the critical transition temperatures have been obtained. The theoretical results are in good agreement with the experiments concerning the Cr alloys.

• Received 30 October 1985

DOI:https://doi.org/10.1103/PhysRevB.33.6147