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Singh, K., Simon, C., Cannuccia, E., Lepetit, M.-B., Corraze, B., Janod, E. & Cario, L. (2014) Orbital-Ordering-Driven Multiferroicity and Magnetoelectric Coupling in GeV4S8. Phys. Rev. Lett. 113 137602. 
Added by: Laurent Cournède (2016-03-10 21:01:55)
Type de référence: Article
DOI: 10.1103/PhysRevLett.113.137602
Numéro d'identification (ISBN etc.): 0031-9007
Clé BibTeX: Singh2014
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Catégories: PMN
Mots-clés: avalanche breakdown, crystal, ferroelectricity, gata4se8, gav4s8, Mott insulators, polarization, superconductivity
Créateurs: Cannuccia, Cario, Corraze, Janod, Lepetit, Simon, Singh
Collection: Phys. Rev. Lett.
Consultations : 7/487
Indice de consultation : 3%
Indice de popularité : 0.75%
Résumé     
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.
Added by: Laurent Cournède  
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