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Phys Rev Lett. 2014 Sep 26;113(13):137602. Epub 2014 Sep 23.

Orbital-ordering-driven multiferroicity and magnetoelectric coupling in GeV₄S₈.

Author information

1
Laboratoire CRISMAT, CNRS UMR 6508, ENSICAEN, 6 Bd. du Maréchal Juin, 14050 Caen Cedex 4, France.
2
Laboratoire CRISMAT, CNRS UMR 6508, ENSICAEN, 6 Bd. du Maréchal Juin, 14050 Caen Cedex 4, France and Institut Laue Langevin, 71 avenue des Martyrs, 38000 Grenoble, France.
3
Institut Laue Langevin, 71 avenue des Martyrs, 38000 Grenoble, France.
4
Institut Laue Langevin, 71 avenue des Martyrs, 38000 Grenoble, France and Institut Néel, CNRS UPR 2940 Département MCBT, 25 avenue des Martyrs, BP 166, 38042 Grenoble Cedex 9, France.
5
Institut des Matériaux Jean Rouxel, Université de Nantes, CNRS, 2 rue de la houssinière, BP32229, 44322 Nantes Cedex 3, France.

Abstract

We report here the discovery of multiferroicity and large magnetoelectric coupling in the type I orbital order system GeV₄S₈. Our study demonstrates that this clustered compound displays a para-ferroelectric transition at 32 K. This transition originates from an orbital ordering which reorganizes the charge within the transition metal clusters. Below the antiferromagnetic transition at 17 K, the application of a magnetic field significantly affects the ferroelectric polarization, revealing thus a large magnetoelectric coupling. Our study suggests that the application of a magnetic field induces a metamagnetic transition which significantly affects the ferroelectric polarization thanks to an exchange striction phenomenon.

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