Abstract
In this supplemental document we explain the details of our ab initio density functional theory calculations and crystal structure searches performed in CaF2 under pressure. Also we report the computed P-dependence of the formation energy of Frenkel pair defects in the cubic fluorite phase, and the vibrational phonon spectra and structural data of the predicted high-T monoclinic P2_1/c phase. Calculated enthalpy energies in compressed SrF2 and BaF2 are also presented.
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