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Neutron scattering in the proximate quantum spin liquid alpha-RuCl3

MPG-Autoren
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Moessner,  Roderich
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Zitation

Banerjee, A., Yan, J., Knolle, J., Bridges, C. A., Stone, M. B., Lumsden, M. D., et al. (2017). Neutron scattering in the proximate quantum spin liquid alpha-RuCl3. SI, 356(6342), 1055-1058. doi:10.1126/science.aah6015.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-002D-C6C5-5
Zusammenfassung
The Kitaev quantum spin liquid (KQSL) is an exotic emergent state of matter exhibiting Majorana fermion and gauge flux excitations. The magnetic insulator alpha-RuCl3 is thought to realize a proximate KQSL. We used neutron scattering on single crystals of alpha-RuCl3 to reconstruct dynamical correlations in energy-momentum space. We discovered highly unusual signals, including a column of scattering over a large energy interval around the Brillouin zone center, which is very stable with temperature. This finding is consistent with scattering from the Majorana excitations of a KQSL. Other, more delicate experimental features can be transparently associated with perturbations to an ideal model. Our results encourage further study of this prototypical material and may open a window into investigating emergent magnetic Majorana fermions in correlated materials.