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Abstract: The coupling between magnetic order and ferroelectricity has been underintense investigation in a wide range of transition-metal oxides. The strongestcoupling is obtained in so-called magnetically-induced multiferroics whereferroelectricity arises directly from magnetic order that breaks inversionsymmetry. However, it has been difficult to find non-oxide based materials inwhich these effects occur. Here we present a study of copper dimethyl sulfoxidedichloride CDC, an organo-metallic quantum magnet containing $S = 1-2$ Cuspins, in which electric polarization arises from non-collinear magnetic order.We show that the electric polarization can be switched in a stunning hystereticfashion. Because the magnetic order in CDC is mediated by large organicmolecules, our study shows that magnetoelectric interactions can exist in thisimportant class of materials, opening the road to designing magnetoelectricsand multiferroics using large molecules as building blocks. Further, wedemonstrate that CDC undergoes a magnetoelectric quantum phase transition whereboth ferroelectric and magnetic order emerge simultaneously as a function ofmagnetic field at very low temperatures.



Autor: V. S. Zapf, M. Kenzelmann, F. Wolff-Fabris, F. Balakirev, Y. Chen

Fuente: https://arxiv.org/







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