Consequences of pressure-instigated spin crossover in RFeO3 perovskites; a volume collapse with no symmetry modification

G. Kh Rozenberg*, M. P. Pasternak, W. M. Xu, L. S. Dubrovinsky, S. Carlson, R. D. Taylor

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

High-pressure X-ray diffraction, Mössbauer, and Raman studies in the antiferromagnetic insulators RFeO3 orthorhombic perovskites (R = Pr, Eu, Lu) disclose an unusual phenomena of a reversible first-order isostructural phase transition around 50 GPa concurring with an abrupt ∼ 5% volume decrease. It is shown experimentally that this transformation concurs with, and is driven by, a high-to-low-spin transition taking place in Fe3+; a manifestation of a new kind of isostructural phase transition. These studies suggest that the RFeO3 perovskite is a rather sturdy oxide-structure, maintaining its original structural symmetry beyond 125 GPa.

Original languageEnglish
Pages (from-to)228-234
Number of pages7
JournalEurophysics Letters
Volume71
Issue number2
DOIs
StatePublished - 15 Jul 2005

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