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

Kimber, Simon A. J. ; Senn, Mark S. ; Fratini, Simone ; Wu, Hua ; Hill, Adrian H. ; Manuel, Pascal ; Attfield, J. Paul ; Argyriou, Dimitri LU and Henry, Paul LU (2012) In Physical Review Letters 108(21).
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.
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
108
issue
21
publisher
American Physical Society
external identifiers
  • wos:000304405000011
  • scopus:84861594715
  • pmid:23003297
ISSN
1079-7114
DOI
10.1103/PhysRevLett.108.217205
language
English
LU publication?
yes
id
e85b42a7-4c80-4f6b-9ce2-03506e24948c (old id 2802874)
date added to LUP
2016-04-01 10:38:32
date last changed
2022-03-12 07:43:03
@article{e85b42a7-4c80-4f6b-9ce2-03506e24948c,
  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.}},
  author       = {{Kimber, Simon A. J. and Senn, Mark S. and Fratini, Simone and Wu, Hua and Hill, Adrian H. and Manuel, Pascal and Attfield, J. Paul and Argyriou, Dimitri and Henry, Paul}},
  issn         = {{1079-7114}},
  language     = {{eng}},
  number       = {{21}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Charge Order at the Frontier between the Molecular and Solid States in Ba3NaRu2O9}},
  url          = {{http://dx.doi.org/10.1103/PhysRevLett.108.217205}},
  doi          = {{10.1103/PhysRevLett.108.217205}},
  volume       = {{108}},
  year         = {{2012}},
}