Slow magnetic relaxation in a europium(II) complex

Errulat, Dylan; Harriman, Katie L. M.; Gálico, Diogo A.; Salerno, Elvin V.; van Tol, Johan; Mansikkamäki, Akseli; Rouzières, Mathieu; Hill, Stephen; Clérac, Rodolphe; Murugesu, Muralee

doi:10.1038/s41467-024-46196-w

Title: Slow magnetic relaxation in a europium(II) complex

Journal Article · 07 April 2024 · Nature Communications

DOI: https://doi.org/10.1038/s41467-024-46196-w · OSTI ID:2311818

Errulat, Dylan ^[1]; Harriman, Katie L. M. ^[2];

^[2]; Salerno, Elvin V. ^[3];

^[3];

^[4];

^[5];

^[3];

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^[2]

University of Ottawa, Ontario (Canada); Florida State University
University of Ottawa, Ontario (Canada)
Florida State University, Tallahassee, FL (United States)
University of Oulu (Finland)
Univ. Bordeaux, Pessac (France)

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^II complex, the [Eu^II(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.

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Research Organization:: Florida State University, Tallahassee, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0020260

OSTI ID:: 2311818

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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