Single phase charge ordered stoichiometric CaFe3O5 with commensurate and incommensurate trimeron ordering View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2019-12-02

AUTHORS

Simon J. Cassidy, Fabio Orlandi, Pascal Manuel, Simon J. Clarke

ABSTRACT

Mixed-valent transition metal compounds display complex structural, electronic and magnetic properties which can often be exquisitely tuned. Here the charge-ordered state of stoichiometric CaFe3O5 is probed using neutron powder diffraction, Monte Carlo simulation and symmetry analysis. Magnetic ordering is dominated by the formation of ferromagnetic Fe3+–Fe2+–Fe3+ trimers which are evident above the magnetic ordering transition. Between TN = 289 K and 281 K an incommensurate magnetically ordered phase develops due to magnetic frustration, but a spin Jahn-Teller distortion lifts the frustration and enables the magnetic ordering to lock in to a charge-ordered commensurate state at lower temperatures. Stoichiometric CaFe3O5 exhibits single phase behaviour throughout and avoids the phase separation into two distinct crystallographic phases with different magnetic structures and Fe valence distributions reported recently, which likely occurs due to partial Fe2+ for Ca2+ substitution. This underlines the sensitivity of the magnetism and chemistry of these mixed-valent systems to composition. More... »

PAGES

5475

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41467-019-13450-5

DOI

http://dx.doi.org/10.1038/s41467-019-13450-5

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1123046071

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/31792221


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