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Effects of strong magnetic fields on neutron $^{3}P_{2}$ superfluidity with spin-orbit interactions
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abstract
We discuss neutron $^{3}P_{2}$ phases in the core of neutron stars in strong magnetic field (magnetars). The neutron $^{3}P_{2}$ pairing provides a wide variety of condensates, such as the uniaxial nematic and (D$_{2}$ and D$_{4}$) biaxial nematic, with different symmetries stemming from the combinations of spin and momentum. Based on the spin-orbital angular momentum coupling and the spin-magnetic field coupling of the neutrons, we derive the Ginzburg-Landau equation containing higher order terms of the magnetic field. We investigate the phase diagram of the neutron $^{3}P_{2}$ superfluidity, and find that the D$_{2}$ biaxial nematic phase is extended by the higher order terms of the magnetic field. We also discuss the thermodynamic properties, the heat capacity and the spin susceptibility.
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Cited by 1 Pith paper
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Critical endpoint and universality class of neutron $^3P_2$ superfluids in neutron stars
The critical endpoint between two nematic phases of neutron 3P2 superfluids shows critical exponents (α≈0.6, β≈0.4, γ≈0.5, δ≈2.3) that the authors interpret as evidence of a new universality class.
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