Berlin 2018 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 25: Ferroics and Multiferroics (joint session KFM/TT/MA)

KFM 25.2: Talk

Thursday, March 15, 2018, 09:50–10:10, EMH 225

Electronic Ferroelectricity in Organic Charge-Transfer Salts — •Jonas K. H. Fischer¹, Peter Lunkenheimer¹, Rudra Manna^2,3, Harald Schubert³, Jens Müller³, Michael Lang³, Stephan Krohns¹, John A. Schlueter⁴, Cecile Mézière⁵, Patrick Batail⁵, and Alois Loidl¹ — ¹Experimental Physics V, EKM, University of Augsburg, Augsburg, Germany — ²Department of Physics, IIT Tirupati, Tirupati 517506, India — ³Phys. Inst. Univ. Frankfurt, SFB/TR 49, Frankfurt, Germany — ⁴Materials Research, National Science Foundation, Arlington, Virginia, United States — ⁵Laboratoire MOLTECH, UMR 6200 CNRS-Université d’Angers, Bt. K, UFR Sciences, Angers, France

The often intriguing dielectric properties of the EDT-TTF-based charge-transfer salts have attracted considerable attention in recent years [1]. Examples are κ-(BEDT-TTF)₂Cu[N(CN)₂]Cl, which exhibits multiferroicity [2], as well as α-(BEDT-TTF)₂I₃, which shows the signature of relaxor-ferroelectric behavior [1].
Here, we will present an overview of the dielectric properties of the above systems and provide new results on κ-(BEDT-TTF)₂Hg(SCN)₂Cl, which also shows ferroelectric behavior in its charge-ordered state. In addition, further organic candidates for ferroelectricity as well as recent results on δ-(EDT-TTF-CONMe₂)₂Br are presented. The latter compound exhibits charge order but lacks dimerization. It displays interesting glasslike relaxation dynamics.
P. Lunkenheimer and A. Loidl, J. Phys.: Condens. Matter 27, 373001 (2015). [2] P. Lunkenheimer et al., Nat. Mater. 11, 755 (2012).