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DF: Fachverband Dielektrische Festkörper

DF 17: Ferroics - Domains, Domain Walls and Skyrmions IV

DF 17.4: Vortrag

Donnerstag, 23. März 2017, 10:45–11:00, WIL B321

Dielectric properties of organic charge-transfer salts — •Jonas K. H. Fischer¹, Peter Lunkenheimer¹, Rudra Manna², Harald Schubert³, Michael Lang³, Jens Müller³, Stephan Krohns¹, John A. Schlueter⁴, Cecile Mézière⁵, Patrick Batail⁵, and Alois Loidl¹ — ¹Experimental Physics V, EKM, University of Augsburg, Augsburg, Germany — ²Experimental Physics VI, EKM, University of Augsburg, Augsburg, Germany — 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 EDT-TTF-based charge-transfer salts have attracted considerable attention due to their intriguing dielectric properties [1]. An example is κ-(BEDT-TTF)₂Cu[N(CN)₂]Cl, which exhibits multiferroicity [2]. Its polar moment was suggested to arise from molecular dimerization, combined with charge order. Other interesting recent examples include 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 seems to show ferroelectric behavior in its charge-ordered state. In addition, we present measurements of δ-(EDT-TTF-CONMe₂)₂Br. This compound lacks dimerization, but exhibits charge order already at room temperature.
P. Lunkenheimer and A. Loidl, J. Phys.: Condens. Matter 27, 373001 (2015). [2] P. Lunkenheimer et al., Nat. Mater. 11, 755 (2012).