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            <title xml:lang="en">X-ray evidence for 2kF charge density wave instability in tetratellurafulvalene-tetracyanoquinodimethane: TTeF-TCNQ</title>
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                <title xml:lang="en">X-ray evidence for 2kF charge density wave instability in tetratellurafulvalene-tetracyanoquinodimethane: TTeF-TCNQ</title>
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              <p>We report an X-ray diffuse scattering study of the charge-transfer salt TteF–TCNQ. This salt develops one-dimensional (1D) 2kF charge density wave (CDW) structural fluctuations which do not condense into superlattice spots down to 20 K, the lowest temperature investigated. This observation allows a charge transfer value of ρ = 0.70±0.02 to be determined, in good agreement with a previous IR spectroscopy determination. We compare these CDW structural fluctuations with those previously observed in other charge-transfer salts like TTF–TCNQ and TSF–TCNQ which undergo a Peierls transition. We suggest that the increase of donor polarizability and of donor bandwidth on going from TTF–TCNQ to TSF–TCNQ, and then to TTeF-TCNQ, makes the CDW instability different between these salts.</p>
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