Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 80: Low-Dimensional Systems - Poster Session
TT 80.13: Poster
Mittwoch, 2. April 2014, 15:00–19:00, P2
Multiferroicity in the Mott insulating charge-transfer salt κ-(BEDT-TTF)2Cu[N(CN)2]Cl — •E. Gati1, P. Lunkenheimer2, J. Müller1, A. Loidl2, B. Hartmann1, N.H. Hoang1, H. Schubert1, J.A. Schlueter3, and M. Lang1 — 1Institute of Physics, Goethe University Frankfurt(M), SFB/TR49, Germany — 2Experimental Physics V, University of Augsburg, Germany — 3Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
Multiferroics are materials which show a coincident electric and magnetic order and have been extensively studied throughout the last years. In a recent work [1], multiferroicity has been found in κ-(BEDT-TTF)2Cu[N(CN)2]Cl, a two-dimensional organic charge-transfer salt. In contrast to well-known spin-driven ferroelectricity in helical magnets, a charge-order-driven mechanism has been proposed in this case. To get more insight into this issue, in particular to check for sample-to-sample variations, we performed measurements of the dielectric constant and magnetic susceptibility [2] on the same single crystals. We confirm that magnetic and electric order appear nearly simultaneously. Furthermore, we discuss results on various other, differently prepared single crystals. The results verify an order-disorder-type ferroelectric state and are incompatible with an inhomogenous, short-range-ordered state which has been proposed recently [3].
P. Lunkenheimer et al., Nature Mater. 11, 755 (2012)
M. Lang et al., arXiv: 1311.2715
S. Tomić et al., J. Phys.: Cond. Mat. 25, 436004 (2013)