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
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
I16-Materials and Magnetism	Noncoplanar and counterrotating incommensurate magnetic order stabilized by kitaev interactions in γ-Li2IrO3 Alun Biffin , Roger Johnson , Itamar Kimchi , Richard Morris , Alessandro Bombardi , James Analytis , Ashvin Vishwanath , Radu Coldea Physical Review Letters 113 (19), 1228-1237 DOI: 10.1103/PhysRevLett.113.197201 PMID: 25415919 Diamond Proposal Number(s): [9919] Show Abstract ▼ Abstract: Materials that realize Kitaev spin models with bond-dependent anisotropic interactions have long been searched for, as the resulting frustration effects are predicted to stabilize novel forms of magnetic order or quantum spin liquids. Here, we explore the magnetism of gamma-Li2IrO3, which has the topology of a three-dimensional Kitaev lattice of interconnected Ir honeycombs. Using magnetic resonant x-ray diffraction, we find a complex, yet highly symmetric incommensurate magnetic structure with noncoplanar and counterrotating Ir moments. We propose a minimal Kitaev-Heisenberg Hamiltonian that naturally accounts for all key features of the observed magnetic structure. Our results provide strong evidence that gamma-Li2IrO3 realizes a spin Hamiltonian with dominant Kitaev interactions.	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