PHONONS IN METALS

By using stationarity properties within the finite temperature density functional approach, it is shown that the calculation of phonons and electron-phonon coupling processes can be based on the coupling between renormalized "bare" phonons and the HRS one-electron system, under the condition that the potential remains "frozen". This explains the success of calculations of phonon anomalies and electron-phonon coupling parameters in transition metals which were based on rigidly moving potentials. The approach is rigorously applied using the LMTO-ASA band method. It is found successful in ab initio calculations of shear moduli in transition metals, and promising for complete phonon and electron-phonon coupling calculations