Ground state in a nonzero moment pairing system. I. Single-particle excitation

A system with nonzero moment pairing can simultaneously contain pairs with distinct arbitrary projections of the moment. Such a state is isotropic and possesses an isotropic excitation spectrum. In this paper the ψ function of the isotropic state is constructed and it is shown that the energy of the ground state is lower than in the Anderson-Morel solution. The single-particle excitation spectrum of the isotropic state coincides with the spectrum in the Gor’kov-Galitskii scheme. In the case of p-pairing, solutions with J = 1 and 2 can be constructed in addition to the isotropic solution with J = 0, which leads to a natural classification of the anisotropic solution.

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