Lattice dynamics of the lanthanides: Samarium at high pressure

H. Olijnyk; A. P. Jephcoat

doi:10.1209/epl/i2004-10354-7

All issues

Volume 69 / No 3 (February 2005)

Europhys. Lett., 69 3 (2005) 385-389

Abstract

Issue		Europhys. Lett. Volume 69, Number 3, February 2005


Page(s)		385 - 389
Section		Condensed matter: structure, mechanical and thermal properties
DOI		https://doi.org/10.1209/epl/i2004-10354-7
Published online		24 December 2004

Europhys. Lett., 69 (3), pp. 385-389 (2005)

Lattice dynamics of the lanthanides: Samarium at high pressure

H. Olijnyk and A. P. Jephcoat

Department of Earth Sciences, University of Oxford - Oxford OX1 3PR, UK

Received: 4 August 2004
Accepted: 19 November 2004

Abstract

Sm was studied by Raman spectroscopy at pressures up to 20 $\un{GPa}$ . 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 $\tx{hcp}\rightarrow\tx{Sm}$ - $\tx{type}\rightarrow\tx{dhcp}\rightarrow \tx{fcc}$ 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

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