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Proximate Kitaev quantum spin liquid behaviour in a honeycomb magnet

Title	Proximate Kitaev quantum spin liquid behaviour in a honeycomb magnet
Authors	A. Banerjee, C. A. Bridges, J.-Q. Yan, A. A. Aczel, L. Li, M. B. Stone, G. E. Granroth, M. D. Lumsden, Y. Yiu, J. Knolle, S. Bhattacharjee, D. L. Kovrizhin, R. Moessner, D. A. Tennant, D. G. Mandrus, S. E. Nagler
Magazine	Nature Materials
Date	04/04/2016
DOI	10.1038/nmat4604
Introduction	Quantum spin liquids (QSLs) represent a class of topological matter known for their exceptional ability to protect quantum information from environmental interference. While identifying their ground states proves challenging due to their featureless nature, their excited states offer clearer insights, particularly with the emergence of novel excitations such as Majorana fermions. Inelastic neutron scattering experiments serve as an effective method for probing these excitations. This work presents findings for alpha-ruthenium trichloride (α-RuCl3), a ruthenium-based material, as part of ongoing efforts to realise the acclaimed Kitaev honeycomb topological QSL, a pursuit previously focused on iridium materials. Our measurements confirm the necessary strong spin-orbit coupling and low-temperature magnetic order, aligning with predictions for materials near a QSL state. We address a long-standing issue by attributing it to stacking faults, which are intrinsic to the material's highly two-dimensional character. Significantly, the material's dynamical response at energies exceeding interlayer scales aligns with the deconfinement physics characteristic of QSLs. By comparing these observations with recent theoretical calculations that include gauge flux excitations and Majorana fermions within the pure Kitaev model, we propose that the excitation spectrum of α-RuCl3 stands as a leading candidate for exhibiting fractionalised Kitaev physics.
Quote	A. Banerjee, C. A. Bridges and J.-Q. Yan et al. Proximate Kitaev quantum spin liquid behaviour in a honeycomb magnet. Nat Mater. 2016. Vol. 15(7):733-740. DOI: 10.1038/nmat4604
Element	Ruthenium (Ru) , Iridium (Ir)
Materials	Chemical Compounds , Crystals
Topics	Smart and Functional Materials , Magnetic Materials , Graphene and 2D Materials , Computational Materials Science
Industry	Research & Laboratory

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