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research article

Direct Observation of the Statics and Dynamics of Emergent Magnetic Monopoles in a Chiral Magnet

Kanazawa, N.
•
Kitaori, A.
•
White, J. S.
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September 25, 2020
Physical Review Letters

In the three-dimensional (3D) Heisenberg model, topological point defects known as spin hedgehogs behave as emergent magnetic monopoles, i.e., quantized sources and sinks of gauge fields that couple strongly to conduction electrons, and cause unconventional transport responses such as the gigantic Hall effect. We observe a dramatic change in the Hall effect upon the transformation of a spin hedgehog crystal in a chiral magnet MnGe through combined measurements of magnetotransport and small-angle neutron scattering (SANS). At low temperatures, well-defined SANS peaks and a negative Hall signal are each consistent with expectations for a static hedgehog lattice. In contrast, a positive Hall signal takes over when the hedgehog lattice fluctuates at higher temperatures, with a diffuse SANS signal observed upon decomposition of the hedgehog lattice. Our approach provides a simple way to both distinguish and disentangle the roles of static and dynamic emergent monopoles on the augmented Hall motion of conduction electrons.

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Type
research article
DOI
10.1103/PhysRevLett.125.137202
Web of Science ID

WOS:000572818800008

Author(s)
Kanazawa, N.
•
Kitaori, A.
•
White, J. S.
•
Ukleev, V
•
Ronnow, H. M.  
•
Tsukazaki, A.
•
Ichikawa, M.
•
Kawasaki, M.
•
Tokura, Y.
Date Issued

2020-09-25

Publisher

AMER PHYSICAL SOC

Published in
Physical Review Letters
Volume

125

Issue

13

Article Number

137202

Subjects

Physics, Multidisciplinary

•

Physics

•

real-space observation

•

skyrmion lattice

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LQM  
Available on Infoscience
October 11, 2020
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/172411
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