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• W2006345475 abstract "The paramagnetic susceptibility of potassium-tetracyanoquinodimethane (K-TCNQ) as a function of temperature is analyzed. K-TCNQ is considered to be in the strong to intermediate correlation regime of the Hubbard model. The magnetic properties are described in terms of a Heisenberg exchange Hamiltonian between localized spins. The magnetic susceptibility of the high-temperature phase is fitted using the Heisenberg uniform-chain theory of Bonner and Fisher with an exchange constant $J$ which is temperature dependent as a result of the thermal expansion along the stacking axis. The low-temperature phase is described using a nonuniform Heisenberg chain with a temperature-dependent order parameter $ensuremath{delta}(T)$ having the BCS dependence as in the spin-Peierls transition. The phase transition comes from a complex displacive structural change between two locally stable overlapping modes of the TCN${mathrm{Q}}^{ensuremath{-}}$ anions which is driven by a dimerization instability of the spin-Peierls type." @default.
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• W2006345475 date "1978-10-01" @default.
• W2006345475 modified "2023-09-26" @default.
• W2006345475 title "Potassium-tetracyanoquinodimethane (K-TCNQ): A spin-Peierls system" @default.
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• W2006345475 doi "https://doi.org/10.1103/physrevb.18.3585" @default.
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