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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 Manna2,3, Harald Schubert3, Jens Müller3, Michael Lang3, Stephan Krohns1, John A. Schlueter4, Cecile Mézière5, Patrick Batail5, and Alois Loidl11Experimental 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).

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