Search Results

You searched for all publications:

with publication states 'Published (Approved)'

Search Again...

These results only include publications that have been reviewed and processed by Diamond Light Source. To also view papers that have not yet been processed click here.

You can use the folder icon under Actions to collate papers as required. You can then click on View Folder in the left-hand navigation to review and/or download your folder.

Exact matches
Related results

2 items found (0 items not approved), displaying all items.1

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] 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 beta-Li2IrO3 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 gamma-Li2IrO3, where dominant Kitaev interactions have been invoked to explain the stability of the observed magnetic structure. The similarities of behaviour between those two structural polytypes, which have different global lattice topologies but the same local connectivity, is strongly suggestive that the same magnetic interactions and the same underlying mechanism governs the stability of the magnetic order in both materials, indicating that both beta- and gamma-Li2IrO3 are strong candidates to realize dominant Kitaev interactions in a solid state material.	Nov 2014

Publications Database

Search Results

You searched for all publications:

Search Again...

Subject Areas (check all that apply) select all

Instruments used to collect data (check all that apply) select all

Collaborations involved (check all that apply) select all

Diamond Offline Facilities used

Relevant Technical Areas (check all that apply) select all

Menu for Anonymous User