The plasma-insulator transition of spin-polarized Hydrogen

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A mixed classical-quantum density functional theory is used to calculate pair correlations and the free energy of a spin-polarized Hydrogen plasma. A transition to an atomic insulator phase is estimated to occur around rₛ=2.5 at T=10⁴K, and a pressure P≈0.5Mbar. Spin polarization is imposed to prevent the formation of H₂ molecules.