Lattice dynamics of the lanthanides: Samarium at high pressure

H. Olijnyk; A. P. Jephcoat

doi:10.1209/epl/i2004-10354-7

Lattice dynamics of the lanthanides: Samarium at high pressure

H. Olijnyk, A. P. Jephcoat

Institute for Planetary Materials

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Sm was studied by Raman spectroscopy at pressures up to 20 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 hep → Sm-type → dhcp → 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.

Original language	English
Pages (from-to)	385-389
Number of pages	5
Journal	Europhysics Letters
Volume	69
Issue number	3
DOIs	https://doi.org/10.1209/epl/i2004-10354-7
Publication status	Published - Feb 1 2005

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Physics and Astronomy(all)

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N2 - Sm was studied by Raman spectroscopy at pressures up to 20 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 hep → Sm-type → dhcp → 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.

AB - Sm was studied by Raman spectroscopy at pressures up to 20 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 hep → Sm-type → dhcp → 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.

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Lattice dynamics of the lanthanides: Samarium at high pressure

Abstract

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