Multiferroicity in the Mott Insulating Charge-Transfer Salt κ-(BEDT-TTF)_2CuN(CN)_2Cl

Michael Lang; Peter Lunkenheimer; Jens MullerAlois LoidlBenedikt HartmannNguyen H. HoangElena GatiHarald SchubertJohn A. Schlueter

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Multiferroicity in the Mott Insulating Charge-Transfer Salt κ-(BEDT-TTF)_2CuN(CN)_2Cl

机译：Multiferroicity in the Mott Insulating Charge-Transfer Salt κ-(BEDT-TTF)_2CuN(CN)_2Cl

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The recently proposed multiferroic state of the charge-transfer salt κ-(BEDT-TTF)_2CuN(CN)_2Cl 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 ε' and the dielectric loss ε" and discuss sample-to-sample variations.

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《IEEE Transactions on Magnetics》 |2014年第1期|2700107-1-2700107-7|共7页
作者
Michael Lang; Peter Lunkenheimer; Jens MullerAlois LoidlBenedikt HartmannNguyen H. HoangElena GatiHarald SchubertJohn A. Schlueter;
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作者单位

Institute of Physics, Goethe-University, 60438 Frankfurt, Germany;

Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany;

Materials Science Division, Argonne National Laboratory, Argonne, IL 60439 USA;

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中图分类计量学;
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Multiferroicity in the Mott Insulating Charge-Transfer Salt κ-(BEDT-TTF)_2CuN(CN)_2Cl

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