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M. Lang, M. de Souza, A. Brühl, Ch. Strack, B. Wolf, R.S. Manna, J.A. Schlueter, D. Schweitzer, J.-P. Pouget Organic charge-transfer salts have been recognized as suitable model systems for studying the interplay of strong electronic correlations and low dimensionality. Depending on the chemical composition and/or hydrostatic pressure, the materials show a rich variety of electronic phases including Mott insulating, spin- and charge-ordered, anomalous metallic, spin-liquid-like as well as superconducting states. In this talk we will address the Mott transition in k-(D8-BEDT-TTF)2Cu[N(CN)2]Br [1], the mysterious charge-order transition coinciding with ferroelectric order in (TMTTF)2X [2] as well as the spin-liquid-like properties observed for k-(BEDT-TTF)2Cu2(CN)3 [3]. Our results highlight the intricate role of the lattice degrees of freedom for stabilizing the various ground states in these strongly correlated Pi-electron systems. [1] M. de Souza et al., Phys. Rev. Lett. 99, 037003 (2007) [2] M. de Souza et al., Phys. Rev. Lett. 101, 216403 (2008) [3] S. Yamashita et al., Nature Phys. 4, 459 (2008) |
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