Helical ordering of magnetic moments in superconductors

A system of electrons and spins is investigated theoretically; in this system the superconducting phase with helical ordering of localized magnetic moments is conserved to zero temperature. It is assumed that in this system of electrons and spins with exchange and electromagnetic interaction between them superconductivity produces helical ordering, i.e., ferromagnetic ordering of spins would be observed without Cooper pairing due to magnetic-dipole interactions. A spin wave approximation for T = O was used to investigate the properties of the superconducting helical phase (the HS-phase). It is demonstrated that the HS-phase is stable locally and that the self-consistent field approximation accurately describes the low-temperature properties of the system. The spin wave spectrum is found together with the magnetic susceptibility of the system and the contribution of the spin waves and the quasi particles to the thermal capacity