Volume 83, Number 3, August 2008
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||30 June 2008|
Dimerization transition of alkali-TCNQ salts: Charge degrees of freedom near the CDW boundary
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: firstname.lastname@example.org
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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