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Enhancing easy-plane anisotropy in bespoke Ni(II) quantum magnets

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Manson, Jamie L., Manson, Zachary E., Sargent, Ashley, Villa, Danielle Y., Etten, Nicole L., Blackmore, William J.A., Curley, Samuel P.M., Williams, Robert C., Brambleby, Jamie, Goddard, Paul A. et al.
(2020) Enhancing easy-plane anisotropy in bespoke Ni(II) quantum magnets. Polyhedron, 180 . 114379. doi:10.1016/j.poly.2020.114379

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Official URL: http://dx.doi.org/10.1016/j.poly.2020.114379

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Abstract

We examine the crystal structures and magnetic properties of several S = 1 Ni(II) coordination compounds, molecules and polymers, that include the bridging ligands HF2−, AF62− (A = Ti, Zr) and pyrazine or non-bridging ligands F−, SiF62−, glycine, H2O, 1-vinylimidazole, 4-methylpyrazole and 3-hydroxypyridine. Pseudo-octahedral NiN4F2, NiN4O2 or NiN4OF cores consist of equatorial Ni-N bonds that are equal to or slightly longer than the axial Ni-Lax bonds. By design, the zero-field splitting (D) is large in these systems and, in the presence of substantial exchange interactions (J), can be difficult to discriminate from magnetometry measurements on powder samples. Thus, we relied on pulsed-field magnetization in those cases and employed electron-spin resonance (ESR) to confirm D when J ≪ D. The anisotropy of each compound was found to be easy-plane (D > 0) and range from ≈ 8–25 K. This work reveals a linear correlation between the ratio d(Ni-Lax)/d(Ni-Neq) and D although the ligand spectrochemical properties may play an important role. We assert that this relationship allows us to predict the type of magnetocrystalline anisotropy in tailored Ni(II) quantum magnets.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Quantum theory, Nickel -- Magnetic properties, Magnetism, Anisotropy
Journal or Publication Title: Polyhedron
Publisher: Elsevier
ISSN: 0277-5387
Official Date: April 2020
Dates:
DateEvent
April 2020Published
22 January 2020Available
17 January 2020Accepted
Volume: 180
Article Number: 114379
DOI: 10.1016/j.poly.2020.114379
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
DMR-1703003National Science Foundationhttp://dx.doi.org/10.13039/501100008982
CHE-1827313National Science Foundationhttp://dx.doi.org/10.13039/501100008982
681260H2020 European Research Councilhttp://dx.doi.org/10.13039/100010663
EP/N023803/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/N024028/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/N032128/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EE18786-15Diamond Light Sourcehttp://dx.doi.org/10.13039/100011889
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