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Structural and Electronic Properties of (TMTTF)2X Salts with Tetrahedral Anions

1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70569 Stuttgart, Germany
Author to whom correspondence should be addressed.
These authors contributed equally to the work.
Permanent address: Institut za fiziku, Bijenička 46, HR-10000 Zagreb, Croatia.
Crystals 2018, 8(3), 121;
Received: 14 February 2018 / Revised: 27 February 2018 / Accepted: 28 February 2018 / Published: 4 March 2018
(This article belongs to the Special Issue Advances in Organic Conductors and Superconductors)
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Comprehensive measurements of the pressure- and temperature-dependent dc-transport are combined with dielectric spectroscopy and structural considerations in order to elucidate the charge and anion orderings in the quasi-one-dimensional charge-transfer salts (TMTTF) 2 X with non-centrosymmetric anions X = BF 4 , ClO 4 and ReO 4 . Upon applying hydrostatic pressure, the charge-order transition is suppressed in all three compounds, whereas the influence on the anion order clearly depends on the particular compound. A review of the structural properties paves the way for understanding the effect of the anions in their methyl cavities on the ordering. By determining the complex dielectric constant ϵ ^ ( ω , T ) in different directions we obtain valuable information on the contribution of the anions to the dielectric properties. For (TMTTF) 2 ClO 4 and (TMTTF) 2 ReO 4 , ϵ b exhibits an activated behavior of the relaxation time with activation energies similar to the gap measured in transport, indicating that the relaxation dynamics are determined by free charge carriers. View Full-Text
Keywords: Fabre salts; one-dimensional conductors; charge order; anion order; electronic transport; pressure dependence; dielectric spectroscopy Fabre salts; one-dimensional conductors; charge order; anion order; electronic transport; pressure dependence; dielectric spectroscopy

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Rösslhuber, R.; Rose, E.; Ivek, T.; Pustogow, A.; Breier, T.; Geiger, M.; Schrem, K.; Untereiner, G.; Dressel, M. Structural and Electronic Properties of (TMTTF)2X Salts with Tetrahedral Anions. Crystals 2018, 8, 121.

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