Elsevier

Physica B+C

Volume 135, Issues 1–3, 2 December 1985, Pages 477-481
Physica B+C

Anomalous low-temperature lattice dynamics of fcc lanthanum

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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.

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