The coexistence region of a superconducting phase and a helical ordering of localized spins is found within an isotropic model of free electrons and localized spins. Superconducting properties of this new phase are also studied. The experimental data regarding the superconducting-magnetic transition in ternary compounds are discussed.

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N. Lebedev Physical Institute, 11 7924 MOSCOW, Leninskii prosp.53, Russia Abetract -For magnetic field calculations of solenoids two methods, due to M. W. Garrett, are de-veloped. The first one consists of the expansion of the magnetic fleld in a zonal harmonic series in the central region of solenoid and in outer space. For both regions the expansion coefficients are given either by simple recurrence relations, or by explicit expressions. In particular, this method is suitable for high accuracy calculations of the fleld within windings. In the second method, the fleld is expressed in terms of incomplete elliptic integrals of the flrst and second kinds computed by use of raising Landen transformations. Given the high precision and high computation rate of this method, it has advantages in analyzing fleld problems for windings consisting of many radial sections carrying different currents, as occurs during the quench of superconducting multisectioned magnets. Also, the general formulas for mutual inductance and axial force between a pair of coaxial solenoids are given.

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