Fig. 2. (Color online) Phonon dispersion of (a) SrTiO3, (b) BaTiO3, (c) RbCaF3, (d) CsSrF3 considering anharmonic effect. Black solid lines correspond to result of harmonic approximation for phonon dispersion. The SCP calculation converged only at the temperature values listed on the temperature scale bar (on the right side of each figure).
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