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We present theoretical results on the high-temperature phase stability andphonon spectra of paramagnetic bcc iron which explicitly take into accountmany-body effects. Several peculiarities, including a pronounced softening ofthe [110] transverse (T$_1$) mode and a dynamical instability of the bcclattice in harmonic approximation are identified. We relate these features tothe ${\alpha}$-to-${\gamma}$ and ${\gamma}$-to-${\delta}$ phase transformationsin iron. The high-temperature bcc phase is found to be highly anharmonic andappears to be stabilized by the lattice entropy.

Electronic correlations determine the phase stability of iron up to the melting temperature