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Nuclear spin assisted quantum tunnelling of magnetic monopoles in spin ice

Paulsen, C., Giblin, S. R., Lhotel, E., Prabhakaran, D., Matsuhira, K., Balakrishnan, G. and Bramwell, S. T. 2019. Nuclear spin assisted quantum tunnelling of magnetic monopoles in spin ice. Nature Communications 10 , 1509. 10.1038/s41467-019-09323-6

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Abstract

Extensive work on single molecule magnets has identified a fundamental mode of relaxation arising from the nuclear-spin assisted quantum tunnelling of nearly independent and quasi-classical magnetic dipoles. Here we show that nuclear-spin assisted quantum tunnelling can also control the dynamics of purely emergent excitations: magnetic monopoles in spin ice. Our low temperature experiments were conducted on canonical spin ice materials with a broad range of nuclear spin values. By measuring the magnetic relaxation, or monopole current, we demonstrate strong evidence that dynamical coupling with the hyperfine fields bring the electronic spins associated with magnetic monopoles to resonance, allowing the monopoles to hop and transport magnetic charge. Our result shows how the coupling of electronic spins with nuclear spins may be used to control the monopole current. It broadens the relevance of the assisted quantum tunnelling mechanism from single molecular spins to emergent excitations in a strongly correlated system.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Nature Publishing Group
ISSN: 2041-1723
Date of First Compliant Deposit: 1 April 2019
Date of Acceptance: 4 March 2019
Last Modified: 04 Apr 2019 10:35
URI: http://orca.cf.ac.uk/id/eprint/121291

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