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Journal Articles Nature Communications Year : 2024

Slow magnetic relaxation in a europium(II) complex

Abstract

Abstract Single-ion anisotropy is vital for the observation of Single-Molecule Magnet (SMM) properties (i.e., a slow dynamics of the magnetization) in lanthanide-based systems. In the case of europium, the occurrence of this phenomenon has been inhibited by the spin and orbital quantum numbers that give way to J = 0 in the trivalent state and the half-filled population of the 4f orbitals in the divalent state. Herein, by optimizing the local crystal field of a quasi-linear bis(silylamido) Eu$^I$$^I$ complex, the [Eu$^I$$^I$ (N{SiMePh$_2$}$_2$)$_2$] SMM is described, providing an example of a europium complex exhibiting slow relaxation of its magnetization. This behavior is dominated by a thermally activated (Orbach-like) mechanism, with an effective energy barrier of approximately 8 K, determined by bulk magnetometry and electron paramagnetic resonance. Ab initio calculations confirm second-order spin-orbit coupling effects lead to non-negligible axial magnetic anisotropy, splitting the ground state multiplet into four Kramers doublets, thereby allowing for the observation of an Orbach-like relaxation at low temperatures.
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hal-04540758 , version 1 (10-04-2024)

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Dylan Errulat, Katie L M Harriman, Diogo A Gálico, Elvin V Salerno, Johan van Tol, et al.. Slow magnetic relaxation in a europium(II) complex. Nature Communications, 2024, 15 (1), pp.3010. ⟨10.1038/s41467-024-46196-w⟩. ⟨hal-04540758⟩

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