Investigation of the field-induced ferromagnetic phase transition in spin polarized neutron matter: a lowest order constrained variational approach

TL;DR

This study uses the LOCV method to explore how strong magnetic fields induce ferromagnetic phase transitions in spin polarized neutron matter, revealing increased stiffness of the equation of state and partial spin polarization.

Contribution

It introduces a detailed analysis of magnetic field effects on neutron matter using LOCV with AV18 potential, highlighting phase transition thresholds and equation of state modifications.

Findings

Ferromagnetic phase transition occurs at magnetic fields > 10^{18} G.

Magnetic field causes partial spin polarization of neutron matter.

Equation of state becomes stiffer under strong magnetic fields.

Abstract

In this paper, the lowest order constrained variational (LOCV) method has been used to investigate the magnetic properties of spin polarized neutron matter in the presence of strong magnetic field at zero temperature employing $AV_{18}$ potential. Our results indicate that a ferromagnetic phase transition is induced by a strong magnetic field with strength greater than $10^{18}\ G$, leading to a partial spin polarization of the neutron matter. It is also shown that the equation of state of neutron matter in the presence of magnetic field is stiffer than the case in absence of magnetic field.