Dimerization transition of alkali-TCNQ salts: charge degrees of freedom near the CDW boundary

Kumar, Manoranjan ; Ramasesha, S. ; Pascal Jr., R. A. ; Soos, Z. G. (2008) Dimerization transition of alkali-TCNQ salts: charge degrees of freedom near the CDW boundary EPL: Europhysics Letters, 83 (3). 37001_1-37001_5. ISSN 0295-5075

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Official URL: http://iopscience.iop.org/0295-5075/83/3/37001

Related URL: http://dx.doi.org/10.1209/0295-5075/83/37001

Abstract

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 δ. Charge-transfer absorption and δ(V) are obtained for a one-dimensional (1D) Hubbard model with long-range Coulomb interactions V that ranges from spin-Peierls at V=0 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.

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Deposited On:13 May 2011 09:40
Last Modified:13 May 2011 09:40

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