Issue |
Europhys. Lett.
Volume 71, Number 2, July 2005
|
|
---|---|---|
Page(s) | 228 - 234 | |
Section | Condensed matter: structural, mechanical and thermal properties | |
DOI | https://doi.org/10.1209/epl/i2005-10071-9 | |
Published online | 08 June 2005 |
Consequences of pressure-instigated spin crossover
in R
perovskites; a volume collapse
with no symmetry modification
1
School of Physics and Astronomy, Tel-Aviv University - Tel-Aviv, Israel
2
Bayerisches Geoinstitut, University Bayreuth - Bayreuth, Germany
3
European Synchrotron Radiation Facility - Grenoble, France
4
MST-10, Los Alamos National Laboratory - Los Alamos, NM 87545, USA
Received:
3
March
2005
Accepted:
11
May
2005
High-pressure X-ray diffraction, Mössbauer, and Raman studies
in the antiferromagnetic insulators R orthorhombic
perovskites (
,
,
) disclose an
unusual phenomena of a reversible first-order isostructural phase
transition around 50
concurring with an abrupt
volume decrease. It is shown experimentally that this
transformation concurs with, and is driven by, a high-to-low-spin
transition taking place in
; a manifestation of a
new kind of isostructural phase transition. These studies suggest
that the R
perovskite is a rather sturdy
oxide-structure, maintaining its original structural symmetry
beyond 125
.
PACS: 61.10.-i – X-ray diffraction and scattering / 62.50.+p – High-pressure and shock wave effects in solids and liquids / 76.80.+y – Mössbauer effect; other γ-ray spectroscopy
© EDP Sciences, 2005
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