Dm. Sedrakian et al., TYPE-I SUPERCONDUCTIVITY OF PROTONS AND MAGNETIC-FIELDS OF PULSARS, Comptes rendus de l'Academie des sciences. Serie II. Mecanique, physique, chimie, astronomie, 325(12), 1997, pp. 763-768
The magnetic structure of neutron vortices in the superfluid cores of
neutron stars is determined assuming that the proton condensate forms
a type-I superconductor. It is shown that the entrainment currents ind
uced by the neutron vortex circulation cause the proton superconductor
to break into normal and superconducting domains of cylindrical form
coaxial with the neutron vortex. The minimum of the energy functional
corresponds to a tube radius a similar to (0.1 - 0.5) b, where b is th
e outer radius of the neutron vortex. The magnetic field within the tu
be is of the order of 5 x 10(14) G.