Cover - Chemistry : A European Journal [POMAM]

Abstract :

Single‐crystal EPR experiments show that the highly symmetric antiferromagnetic half‐integer spin triangle [Fe₃O(O₂CPh)₆(py)₃]ClO₄⋅py (1, py=pyridine) possesses a S_T=1/2 ground state exhibiting high g‐anisotropy due to antisymmetric exchange (Dzyaloshinskii–Moriya) interactions. EPR experiments under static electric fields parallel to the triangle's plane (i.e., perpendicular to the magnetic z‐axis) reveal that this ground state couples to externally applied electric fields. This magnetoelectric coupling causes an increase in the intensity of the intradoublet EPR transition and does not affect its resonance position when B₀∥z. The results are discussed on the basis of theoretical models correlating the spin chirality of the ground state with the magnetoelectric effect.

Reference :

Athanassios K. Boudalis, Jérôme Robert, and Philippe Turek

First Demonstration of Magnetoelectric Coupling in a Polynuclear Molecular Nanomagnet: Single‐Crystal EPR Studies of [Fe₃O(O₂CPh)₆(py)₃]ClO₄⋅py under Static Electric Fields

Chemistry : A European Journal, first published : 27 September 2018 - DOI: https://doi.org/10.1002/chem.201803038

Contact chercheur :

Athanassios K. Boudalis, POMAM, Institut de Chimie (UMR 7177).