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Evidence for electronically-driven ferroelectricity in the family of strongly correlated dimerized BEDT-TTF molecular conductors by Gati, Elena; Fischer, Jonas K. H.; Lunkenheimer, Peter; Zielke, David; Köhler, Sebastian; Kolb, Felizitas; von Nidda, Hans-Albrecht Krug; Winter, Stephen M.; Schubert, Harald; Schlueter, John A.; Jeschke, Harald O.; Valenti, Roser; Lang, Michael is a scholarly article available to read on EtoBox.

What is Evidence for electronically-driven ferroelectricity in the family of strongly correlated dimerized BEDT-TTF molecular conductors about?

By applying measurements of the dielectric constants and relative length changes to the dimerized molecular conductor $\kappa$-(BEDT-TTF)$_2$Hg(SCN)$_2$Cl, we provide evidence for order-disorder type electronic ferroelectricity which is driven by charge order within the (BEDT-TTF)$_2$ dimers and stabilized by a coupling to the anions. According to our density functional theory calculations, this material is characterized by a moderate strength of dimerization. This system thus bridges the gap between strongly dimerized materials, often approximated as dimer-Mott systems at 1/2 filling, and non- or weakly dimerized systems at 1/4 filling exhibiting charge order. Our results indicate that intra-dimer charge degrees of freedom are of particular importance in correlated $\kappa$-(BEDT-TTF)$_2$X salts and can create novel states, such as electronically-driven multiferroicity or charge-order-induced quasi-1D spin liquids.

Author

Gati, Elena; Fischer, Jonas K. H.; Lunkenheimer, Peter; Zielke, David; Köhler, Sebastian; Kolb, Felizitas; von Nidda, Hans-Albrecht Krug; Winter, Stephen M.; Schubert, Harald; Schlueter, John A.; Jeschke, Harald O.; Valenti, Roser; Lang, Michael

Published

2017

Language

EN