Spin electric effect on a chiral lanthanide complex Leonardo Tacconi 1 , Matteo Briganti 1 , Alberto Cini 2 , Lorenzo Tesi 3 , Lorenzo Sorace 1 ,
Joris van Slageren 3 , Maria Fittipaldi 2 and Mauro Perfetti 1 1 Department of Chemistry, “Ugo Schiff”, University of Florence, Italy 2 Department of Physics, University of Florence, Italy 3 Institut für Physikalische Chemie, Universität Stuttgart, Germany
Molecular materials such as Single Molecule Magnets and Qubits constitute a great resource for the future information technology. Nowadays, the information is customarily written and read with magnetic field-based methods, that are however not suitable for molecular-scale devices. On the contrary, electric fields can be applied at the single-atom scale [1] , making them an attractive alternative to magnetic fields. Therefore, understanding how electric fields interact with the spin of the molecules (i.e. the Spin-Electric effect) becomes a crucial step for a more efficient data processing on such small systems.
Figure 1 – a) Structure of the chiral coordination compound Dy(oda) 3 ; b) anisotropy switch highlighted by magnetometry; c) effect of the application of an electric field detected by EFM-EPR on Δ and Λ enantiomers. Within the framework outlined above, we present a study on the Spin-Electric effect obtained on a chiral lanthanide complex with chemical formula Na 5 [Dy(oda) 3 ](BF 4 ) 2 (H 2 O) 6 (oda = oxodiacetate), reported in Figure 1a. [2] A multitechnique approach has been deployed to characterize the molecule. In particular, single crystal DC magnetometry combined with torque magnetometry (Figure 1b) evidenced a magnetic anisotropy switch from easy axis to easy plane at ca. 10 K. Electric Field Modulated-Electron Paramagnetic Resonance (EFM-EPR) [3] has been used to measure the Spin-Electric effect (Figure 1c) on both enantiomers, referred to as Δ and Λ. This allowed us to observe that opposite chirality leads to a reverse of the Spin-Electric effect . To model what observed experimentally, experiments have been combined with CASSCF calculations to obtain the Hamiltonian parameters of the molecule. Particularly, a model with a variation of the effective g-factor is proposed. We want to acknowledge the European Research Council for supporting this work (ELECTRA, 101039890). References 1. Eigler et al., Nature 1990 , 344(6266) , 524-526
2. Lennarston et al., CrystEngComm 2009 , 11(9), 1979-1986 3. Fittipaldi et al., Nature Materials 2019 , 18(4), 329-334
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