Correlations and spin susceptibility of lowst-energy Cooper pairing in an antiferromagnet

Lowest-energy Cooper pairing of electron eigenfunctions in an antiferromagnetic metal is transformed to $\text{k}$-wave or nonmagnetic-Bloch-function space, where the pairing is resolved into wave-vector and spin components. The spin susceptibility is calculated using an eight-component field in Bloch function space.