Anomalies caused in phonon spectra by charge density fluctuations
Katsnel'son M. I., Trefilov A. V.
Charge density fluctuations cause anomalies in the phonon spectra and lattice properties of systems which have narrow peaks in the state density near the Fermi level (in particular, compounds with the A15 structure and heavy-fermion systems). These anomalies should intensify anharmonic effects. An experimental study of these features might explain the nature of the peaks in the state density in heavy-fermion systems.