Slow magnetic relaxation in a europium(II) complex

Dylan Errulat, Katie L. M. Harriman, Diogo A. Gálico, Elvin V. Salerno, Johan Tol, Akseli Mansikkamäki, Mathieu Rouzières, Stephen Hill (), Rodolphe Clérac () and Muralee Murugesu ()
Additional contact information
Dylan Errulat: University of Ottawa
Katie L. M. Harriman: University of Ottawa
Diogo A. Gálico: University of Ottawa
Elvin V. Salerno: Florida State University
Johan Tol: Florida State University
Akseli Mansikkamäki: University of Oulu
Mathieu Rouzières: Univ. Bordeaux, CNRS
Stephen Hill: Florida State University
Rodolphe Clérac: Univ. Bordeaux, CNRS
Muralee Murugesu: University of Ottawa

Nature Communications, 2024, vol. 15, issue 1, 1-8

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) EuII complex, the [EuII(N{SiMePh2}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.

Date: 2024
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DOI: 10.1038/s41467-024-46196-w

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