Ferromagnetic instabilities in neutron matter at finite temperature with the Skyrme interaction

Abstract

The properties of spin polarized neutron matter are studied both at zero and finite temperature using Skyrme-type interactions. It is shown that the critical density at which ferromagnetism takes place decreases with temperature. This unexpected behaviour is associated to an anomalous behaviour of the entropy which becomes larger for the polarized phase than for the unpolarized one above a certain critical density. This fact is a consequence of the dependence of the entropy on the effective mass of the neutrons with different third spin component and a new constraint on the parameters of the effective Skyrme force is derived in order to avoid such a behaviour.

arXiv commentREVTEX4 - 18 pages, 8 figures, 2 tables Revised according to referee comments - Submitted to Phys. Rev. C

References in corpus (6)

• Spin susceptibility of neutron matter at zero temperature
• Instabilities of infinite matter with effective Skyrme-type interactions
• Equation of state and magnetic susceptibility of spin polarized isospin asymmetric nuclear matter
• Spin polarized neutron matte and magnetic susceptibility within the Brueckner-Hartree-Fock approximation
• Spin polarized states in strongly asymmetric nuclear matter
• Neutrino propagation and spin zero sound in hot neutron matter with Skyrme interactions

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