| Issue |
EPL
Volume 83, Number 3, August 2008
|
|
|---|---|---|
| Article Number | 37001 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/83/37001 | |
| Published online | 30 June 2008 | |
Dimerization transition of alkali-TCNQ salts: Charge degrees of freedom near the CDW boundary
1
Solid State and Structural Chemistry Unit, Indian Institute of Science - Bangalore 560012, India
2
Department of Chemistry, Princeton University - Princeton, NJ 08544, USA
Corresponding author: soos@princeton.edu
Received:
22
May
2008
Accepted:
16
June
2008
Stacks of TCNQ- radical ions in 1 : 1 alkali salts are
shown to be near the charge-density-wave (CDW) boundary, where charge degrees of freedom induce strong dimerization 
. Charge-transfer
absorption and 
are obtained for a one-dimensional (1D) Hubbard
model with long-range Coulomb interactions V that ranges from spin-Peierls
at 
to the CDW boundary at Vc and beyond. Cation
dimerization lifts the degeneracy of Peierls systems and confers 3D contributions to the dimerization transition of alkali-TCNQ salts.
PACS: 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 71.30.+h – Metal-insulator transitions and other electronic transitions / 71.45.Lr – Charge-density-wave systems
© EPLA, 2008
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