Physics – Condensed Matter – Superconductivity
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phrvb..65r4522j&link_type=abstract
Physical Review B, vol. 65, Issue 18, id. 184522
Physics
Condensed Matter
Superconductivity
Magnetic Properties, Pulsars, Neutron Stars
Scientific paper
We report on a study of the evolution of magnetic fields of neutron stars, driven by the expulsion of magnetic flux out of the proton superconducting core of the star. The rate of expulsion, or equivalently the velocity of outward motion of flux-carrying proton-vortices is determined from a solution of their equation of motion. A determination of the effective forces on the fluxoids moving through the quantum liquid interior of neutron stars is however confronted with many ambiguities about the properties of this special case of superconductivity in the nature, which are highlighted here. The role of the various forces, on fluxoids, in determining the magnetic evolution of the star has been a controversial issue. We argue that the pinning force due to the neutron superfluid vortices, plays a crucial role in driving the outward motion of the fluxoids, in contrast to the earlier claims for its opposing effects against the flux expulsion.
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