| Issue |
Europhys. Lett.
Volume 33, Number 9, March III 1996
|
|
|---|---|---|
| Page(s) | 679 - 682 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1996-00398-1 | |
| Published online | 01 September 2002 | |
The pressure dependence of the Ta1[110] phonon frequencies in the ordered Invar alloy Fe3Pt at pressures up to 7 GPa
1
Institut für Angewandte Physik, Universität
Erlangen-Nürnberg 91054 Erlangen, Germany
2
Physique des Milieux Condensés, Université P. et M. Curie Tour 13, B77, 4 Place
Jussieu, 75252 Paris, France
3
Laboratoire Léon Brillouin - 91191 Gif sur Yvette, France
4
Forschungszentrum Karlsruhe, Institut für Nukl. Festkörperphysik
76021 Karlsruhe, Germany
Received:
15
December
1995
Accepted:
30
January
1996
The pressure dependence of the ![$\rm TA_1[110]$](/articles/epl/abs/1996/09/33905/33905_tex_eq3.png)
phonon frequencies
in ordered 
was studied by inelastic neutron scattering up to 7 GPa.
Very large frequency shifts (
) were observed in this pressure
range. We found that the mode Grüneisen parameters remain very large
(
) for pressures exceeding the critical pressure of about 3 GPa,
which drives ordered from a high-spin to a low-spin state.
This indicates that the unusually large Grüneisen parameters
are probably not a magnetoelastic effect, but rather have to be associated
with the martensitic instability.
PACS: 68.35.Rh – Phase transitions and critical phenomena
© EDP Sciences, 1996
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.