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Instruments / Technical Area	Publication Details	Published	Actions
I11-High Resolution Powder Diffraction	Enhancing easy-plane anisotropy in bespoke Ni(II) quantum magnets Jamie L. Manson , Zachary E. Manson , Ashley Sargent , Danielle Y. Villa , Nicole L. Etten , William J. A. Blackmore , Samuel P. M. Curley , Robert C. Williams , Jamie Brambleby , Paul A. Goddard , Andrew Ozarowski , Murray N. Wilson , Benjamin M. Huddart , Tom Lancaster , Roger D. Johnson , Stephen J. Blundell , Jesper Bendix , Kraig A. Wheeler , Saul H. Lapidus , Fan Xiao , Serena Birnbaum , John Singleton Polyhedron DOI: 10.1016/j.poly.2020.114379 Diamond Proposal Number(s): [18786] Open Access Show Abstract ▼ 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 also be important. We assert that this relationship allows us to predict the type of magnetocrystalline anisotropy in tailored Ni(II) quantum magnets.	Jan 2020
I16-Materials and Magnetism	Unconventional magnetic order on the hyperhoneycomb Kitaev lattice in [Beta]-Li2IrO3: Full solution via magnetic resonant x-ray diffraction Alun Biffin , Roger Johnson , Sungkyun Choi , F. Freund , S. Manni , Alessandro Bombardi , Pascal Manuel , P. Gegenwart , Radu Coldea Physical Review B 90 (20) DOI: 10.1103/PhysRevB.90.205116 Diamond Proposal Number(s): [10312] Show Abstract ▼ Abstract: The recently synthesized iridate β − Li 2 IrO 3 has been proposed as a candidate to display novel magnetic behavior stabilized by frustration effects from bond-dependent, anisotropic interactions (Kitaev model) on a three-dimensional “hyperhoneycomb” lattice. Here we report a combined study using neutron powder diffraction and magnetic resonant x-ray diffraction to solve the complete magnetic structure. We find a complex, incommensurate magnetic order with non-coplanar and counter-rotating Ir moments, which surprisingly shares many of its features with the related structural polytype “stripyhoneycomb” γ − Li 2 IrO 3 , where dominant Kitaev interactions have been invoked to explain the stability of the observed magnetic structure. The similarities of behavior between those two structural polytypes, which have different global lattice topologies but the same local connectivity, are strongly suggestive that the same magnetic interactions and the same underlying mechanism govern the stability of the magnetic order in both materials, indicating that both β - and γ − Li 2 IrO 3 are strong candidates to realize dominant Kitaev interactions in a solid state material.	Nov 2014

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