On the nonphonon superconductivity of silver-oxygen chains

It is established on the basis of a concept of strong coupling in a single unit cell that the Cooper instability can occur in a system with hopping between the cations and anions of transition and main-group elements. A phase diagram is constructed for the ferromagnetic ordering in the coordinates ($h_d$, $h_p$) of the degrees of underfilling of, respectively, the $4d^{10}$ and $2p^6$ shells of transition and main-group elements.