Polyanisotropic Magnetoelectric Coupling in an Electrically Controlled Molecular Spin Qubit

Jérôme Robert (1) , Nathalie Parizel (2) , Philippe Turek (2) , Athanassios K Boudalis (2)

1 LJP - Laboratoire Jean Perrin
2 Institut de Chimie de Strasbourg

Two molecular spin qubits are studied with pulsed Electron Paramagnetic Resonance (EPR) spectroscopy under electric fields to assess their magnetoelectric (ME) couplings and electric spin control. [Fe 3 O(PhCOO) 6 (py) 3 ]ClO 4 ⋅py (Fe 3) is characterized by strong Dzyaloshinskii-Moriya interactions (DMI) which induce important magnetoanisotropy, whereas the DMI in [Cr 3 O(PhCOO) 6 (py) 3 ]ClO 4 ⋅0.5py (Cr 3) is 1-2 orders of magnitude weaker. Fe 3 is observed to demonstrate a clear ME effect whose intensity shows an unprecedented dependence on the molecular orientation within the electric field E (electroanisotropy) and on the relative orientations of the molecular z-axis, the Zeeman field B 0 and E (magnetoelectric anisotropy). The electric control in Fe 3 is shown to be coherent and the ME effect exhibits complex dynamics characterized by saturation and oscillatory effects. On the other hand, Cr 3 exhibits no discernible ME effect, which correlates well with its negligible DMI.

Domaines: Chimie de coordination

Jérôme Robert, Nathalie Parizel, Philippe Turek, Athanassios K Boudalis. Polyanisotropic Magnetoelectric Coupling in an Electrically Controlled Molecular Spin Qubit. Journal of the American Chemical Society, 2019, 141 (50), pp.19765-19775. ⟨10.1021/jacs.9b09101⟩. ⟨hal-02444329⟩