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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.
Please use this url to cite or link to this publication:
author
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
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
2012-06-25 12:42:21
date last changed
2017-08-20 03:17:27
@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},
  volume       = {108},
  year         = {2012},
}