Correlation-driven electronic multiferroicity in (TMTTF)${}_2$-$X$ organic crystals

Abstract

Using a combination of density functional theory and dynamical mean field theory we show that electric polarization and magnetism are strongly intertwined in (TMTTF)${}_2$-$X$ (X$=$PF${}_6$, As$F_6$, and SbF${}_6$) organic crystals and they originate from short-range Coulomb interactions. Electronic correlations induce a charge-ordered state which, combined with the molecular dimerization, gives rise to a finite electronic polarization and to a ferroelectric state. We predict that the value of the electronic polarization is enhanced by the onset of antiferromagnetism showing a sizable magnetoelectric leading to a multiferroic behavior of (TMTTF)${}_2$-$X$ compounds.

5 pages, 4 figures

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Cited by in corpus (2)

• Ferroelectric properties of charge-ordered alpha-(BEDT-TTF)2I3
• Diversity of charge orderings in correlated systems