Charge Order at the Frontier between the Molecular and Solid States in Ba3NaRu2O9

Simon A. J. Kimber, Mark S. Senn, Simone Fratini, Hua Wu, Adrian H. Hill, Pascal Manuel, J. Paul Attfield, Dimitri N. Argyriou, Paul. F. Henry

Research output: Contribution to journalArticlepeer-review

Abstract

We show that the valence electrons of Ba3NaRu2O9, which has a quasimolecular structure, completely crystallize below 210 K. Using an extended Hubbard model, we show that the charge ordering instability results from long-range Coulomb interactions. However, orbital ordering, metal-metal bonding, and formation of a partial spin gap enforce the magnitude of the charge separation. The striped charge order and frustrated hcp lattice of Ru2O9 dimers lead to competition with a quasidegenerate charge-melted phase under photoexcitation at low temperature. Our results establish a broad class of simple metal oxides as models for emergent phenomena at the border between the molecular and solid states.

Original languageEnglish
Article number217205
JournalPhysical Review Letters
Volume108
Issue number21
Early online date24 May 2012
DOIs
Publication statusPublished - 2012

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