Abstract
The giant Kohn anomaly recently observed in the low temperature, metastable fcc-phase of lanthanum is shown to arise from a sharp nesting feature of the Fermi surface. The calculated phonon dispersion curves exhibit a strong, narrow dip in the transverse (111) branch at precisely the experimental wave vector. Further calculations at 14% smaller volume indicate this branch becomes softer with pressure, which helps explain the unusual negative thermal expansion and the observed structural transition near 50 kbar.
Full Text
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call