Volume 69, Number 3, February 2005
|Page(s)||385 - 389|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||24 December 2004|
Lattice dynamics of the lanthanides: Samarium at high pressure
Department of Earth Sciences, University of Oxford - Oxford OX1 3PR, UK
Accepted: 19 November 2004
Sm was studied by Raman spectroscopy at pressures up to 20. The Raman-active phonon modes, both of the Sm-type phase and the dhcp phase, show a frequency decrease as pressure increases. There is evidence that the entire structural sequence - under pressure for the individual regular lanthanides is associated with softening of certain acoustic and optical-phonon modes as well as elastic anomalies. Comparison is made to corresponding transitions between close-packed lattices in other metals and possible relations to the lanthanide's electronic structure are addressed.
PACS: 62.50.+p – High-pressure and shock wave effects in solids and liquids / 64.70.Kb – Solid-solid transitions / 63.20.-e – Phonons in crystal lattices
© EDP Sciences, 2005
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