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In the case of europium, the occurrence of this phenomenon has been inhibited by the spin and orbital quantum numbers that give way to <jats:italic>J<\/jats:italic>\u2009=\u20090 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<jats:sup>II<\/jats:sup> complex, the [Eu<jats:sup>II<\/jats:sup>(N{SiMePh<jats:sub>2<\/jats:sub>}<jats:sub>2<\/jats:sub>)<jats:sub>2<\/jats:sub>] 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\u2009K, 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.<\/jats:p>","DOI":"10.1038\/s41467-024-46196-w","type":"journal-article","created":{"date-parts":[[2024,4,8]],"date-time":"2024-04-08T11:02:08Z","timestamp":1712574128000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":31,"title":["Slow magnetic relaxation in a europium(II) complex"],"prefix":"10.1038","volume":"15","author":[{"given":"Dylan","family":"Errulat","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katie L. 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