Multiferroicity in the Mott Insulating Charge-Transfer Salt $\kappa-({\rm BEDT-TTF})_{2}{\rm Cu}[{\rm N}({\rm CN})_{2}]{\rm Cl}$

Autor:	Elena Gati, N.H. Hoang, Harald Schubert, Benedikt Hartmann, John A. Schlueter, Peter Lunkenheimer, Jens Müller, Alois Loidl, Michael Lang
Rok vydání:	2014
Předmět:	Condensed Matter::Materials Science Materials science Condensed matter physics Antiferromagnetism Dielectric loss Multiferroics Dielectric Frequency dependence Electrical and Electronic Engineering Magnetic susceptibility Ferroelectricity Electronic Optical and Magnetic Materials
Zdroj:	IEEE Transactions on Magnetics. 50:1-7
ISSN:	1941-0069 0018-9464
Popis:	The recently proposed multiferroic state of the charge-transfer salt {\kappa}-(BEDT-TTF)$_2$Cu[N(CN)$_2$]Cl [P. Lunkenheimer et al., Nature Mater., vol. 11, pp. 755-758, Sept. 2012] has been studied by dc-conductivity, magnetic susceptibility and measurements of the dielectric constant on various, differently prepared single crystals. In the majority of crystals we confirm the existence of an order-disorder-type ferroelectric state which coincides with antiferromagnetic order. This phenomenology rules out scenarios which consider an inhomogeneous, short-range-ordered ferroelectric state. Measurements of the dielectric constant and the magnetic susceptibility on the same crystals reveal that both transitions lie very close to each other or even collapse, indicating that both types of order are intimately coupled to each other. We address issues of the frequency dependence of the dielectric constant {\epsilon}' and the dielectric loss {\epsilon}'' and discuss sample-to-sample variations.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ccbda06fb3f291e5bf452b49e8b7c36f https://doi.org/10.1109/tmag.2013.2296333 Zobrazit plný text záznamu