Weyl metallic state induced by helical magnetic order

Jian Rui Soh; Irián Sánchez-Ramírez; Xupeng Yang; Jinzhao Sun; Ivica Zivkovic; J. Alberto Rodríguez-Velamazán; Oscar Fabelo; Anne Stunault; Alessandro Bombardi; Christian Balz; Manh Duc Le; Helen C. Walker; J. Hugo Dil; Dharmalingam Prabhakaran; Henrik M. Rønnow; Fernando de Juan; Maia G. Vergniory; Andrew T. Boothroyd

doi:10.1038/s41535-023-00604-4

Weyl metallic state induced by helical magnetic order

Jian Rui Soh, Irián Sánchez-Ramírez, Xupeng Yang, Jinzhao Sun, Ivica Zivkovic, J. Alberto Rodríguez-Velamazán, Oscar Fabelo, Anne Stunault, Alessandro Bombardi, Christian Balz, Manh Duc Le, Helen C. Walker, J. Hugo Dil, Dharmalingam Prabhakaran, Henrik M. Rønnow, Fernando de Juan, Maia G. Vergniory, Andrew T. Boothroyd

Direct Geometry

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6 Scopus citations

Abstract

In the rapidly expanding field of topological materials there is growing interest in systems whose topological electronic band features can be induced or controlled by magnetism. Magnetic Weyl semimetals, which contain linear band crossings near the Fermi level, are of particular interest owing to their exotic charge and spin transport properties. Up to now, the majority of magnetic Weyl semimetals have been realized in ferro- or ferrimagnetically ordered compounds, but a disadvantage of these materials for practical use is their stray magnetic field which limits the minimum size of devices. Here we show that Weyl nodes can be induced by a helical spin configuration, in which the magnetization is fully compensated. Using a combination of neutron diffraction and resonant elastic x-ray scattering, we find that below T _N = 14.5 K the Eu spins in EuCuAs develop a planar helical structure which induces two quadratic Weyl nodes with Chern numbers C = ±2 at the A point in the Brillouin zone.

Original language	English
Article number	7
Journal	npj Quantum Materials
Volume	9
Issue number	1
DOIs	https://doi.org/10.1038/s41535-023-00604-4
State	Published - Dec 2024

Funding

The authors wish to thank Gareth Nisbet, Robert Pocock, Dan Porter, Sid Parameswaran, Steve Simon and Ross Stewart for discussions, Toby Perring for providing the software used to powder-average the spin-wave spectrum presented in Fig. 5 b, and Pascal Manuel, Dmitry Khalyavin and Fabio Orlandi for help with the powder diffraction experiment on WISH at the ISIS Facility. The proposal numbers for the data presented in this manuscript are 5-41-1048 (D9, ILL59), 5-54-368 (D3, ILL60), 20220501 (SIS-ULTRA, SLS), RB1820237 (WISH, ISIS61), RB2090057 (LET, ISIS62) RB1920514 (Merlin, ISIS63), MT20347-1 (I16, DLS). D.P. and A.T.B. acknowledge support from the Oxford-ShanghaiTech collaboration project. This research was funded in part by the UKRI, grant No. EP/M020517/1. For the purpose of Open Access, the author has applied a CC BY public copyright licence to any Author Accepted Manuscript version arising from this submission. J.-R.S. acknowledges support from the Singapore National Science Scholarship, Agency for Science Technology and Research and the European Research Council (HERO, Grant No. 810451). The authors wish to thank Gareth Nisbet, Robert Pocock, Dan Porter, Sid Parameswaran, Steve Simon and Ross Stewart for discussions, Toby Perring for providing the software used to powder-average the spin-wave spectrum presented in Fig. b, and Pascal Manuel, Dmitry Khalyavin and Fabio Orlandi for help with the powder diffraction experiment on WISH at the ISIS Facility. The proposal numbers for the data presented in this manuscript are 5-41-1048 (D9, ILL), 5-54-368 (D3, ILL), 20220501 (SIS-ULTRA, SLS), RB1820237 (WISH, ISIS), RB2090057 (LET, ISIS) RB1920514 (Merlin, ISIS), MT20347-1 (I16, DLS). D.P. and A.T.B. acknowledge support from the Oxford-ShanghaiTech collaboration project. This research was funded in part by the UKRI, grant No. EP/M020517/1. For the purpose of Open Access, the author has applied a CC BY public copyright licence to any Author Accepted Manuscript version arising from this submission. J.-R.S. acknowledges support from the Singapore National Science Scholarship, Agency for Science Technology and Research and the European Research Council (HERO, Grant No. 810451).

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10.1038/s41535-023-00604-4

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Soh, J. R., Sánchez-Ramírez, I., Yang, X., Sun, J., Zivkovic, I., Rodríguez-Velamazán, J. A., Fabelo, O., Stunault, A., Bombardi, A., Balz, C., Le, M. D., Walker, H. C., Dil, J. H., Prabhakaran, D., Rønnow, H. M., de Juan, F., Vergniory, M. G., & Boothroyd, A. T. (2024). Weyl metallic state induced by helical magnetic order. npj Quantum Materials, 9(1), Article 7. https://doi.org/10.1038/s41535-023-00604-4

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title = "Weyl metallic state induced by helical magnetic order",

abstract = "In the rapidly expanding field of topological materials there is growing interest in systems whose topological electronic band features can be induced or controlled by magnetism. Magnetic Weyl semimetals, which contain linear band crossings near the Fermi level, are of particular interest owing to their exotic charge and spin transport properties. Up to now, the majority of magnetic Weyl semimetals have been realized in ferro- or ferrimagnetically ordered compounds, but a disadvantage of these materials for practical use is their stray magnetic field which limits the minimum size of devices. Here we show that Weyl nodes can be induced by a helical spin configuration, in which the magnetization is fully compensated. Using a combination of neutron diffraction and resonant elastic x-ray scattering, we find that below T N = 14.5 K the Eu spins in EuCuAs develop a planar helical structure which induces two quadratic Weyl nodes with Chern numbers C = ±2 at the A point in the Brillouin zone.",

author = "Soh, \{Jian Rui\} and Iri{\'a}n S{\'a}nchez-Ram{\'i}rez and Xupeng Yang and Jinzhao Sun and Ivica Zivkovic and Rodr{\'i}guez-Velamaz{\'a}n, \{J. Alberto\} and Oscar Fabelo and Anne Stunault and Alessandro Bombardi and Christian Balz and Le, \{Manh Duc\} and Walker, \{Helen C.\} and Dil, \{J. Hugo\} and Dharmalingam Prabhakaran and R{\o}nnow, \{Henrik M.\} and \{de Juan\}, Fernando and Vergniory, \{Maia G.\} and Boothroyd, \{Andrew T.\}",

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doi = "10.1038/s41535-023-00604-4",

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Soh, JR, Sánchez-Ramírez, I, Yang, X, Sun, J, Zivkovic, I, Rodríguez-Velamazán, JA, Fabelo, O, Stunault, A, Bombardi, A, Balz, C, Le, MD, Walker, HC, Dil, JH, Prabhakaran, D, Rønnow, HM, de Juan, F, Vergniory, MG & Boothroyd, AT 2024, 'Weyl metallic state induced by helical magnetic order', npj Quantum Materials, vol. 9, no. 1, 7. https://doi.org/10.1038/s41535-023-00604-4

TY - JOUR

T1 - Weyl metallic state induced by helical magnetic order

AU - Soh, Jian Rui

AU - Sánchez-Ramírez, Irián

AU - Yang, Xupeng

AU - Sun, Jinzhao

AU - Zivkovic, Ivica

AU - Rodríguez-Velamazán, J. Alberto

AU - Fabelo, Oscar

AU - Stunault, Anne

AU - Bombardi, Alessandro

AU - Balz, Christian

AU - Le, Manh Duc

AU - Walker, Helen C.

AU - Dil, J. Hugo

AU - Prabhakaran, Dharmalingam

AU - Rønnow, Henrik M.

AU - de Juan, Fernando

AU - Vergniory, Maia G.

AU - Boothroyd, Andrew T.

PY - 2024/12

Y1 - 2024/12

N2 - In the rapidly expanding field of topological materials there is growing interest in systems whose topological electronic band features can be induced or controlled by magnetism. Magnetic Weyl semimetals, which contain linear band crossings near the Fermi level, are of particular interest owing to their exotic charge and spin transport properties. Up to now, the majority of magnetic Weyl semimetals have been realized in ferro- or ferrimagnetically ordered compounds, but a disadvantage of these materials for practical use is their stray magnetic field which limits the minimum size of devices. Here we show that Weyl nodes can be induced by a helical spin configuration, in which the magnetization is fully compensated. Using a combination of neutron diffraction and resonant elastic x-ray scattering, we find that below T N = 14.5 K the Eu spins in EuCuAs develop a planar helical structure which induces two quadratic Weyl nodes with Chern numbers C = ±2 at the A point in the Brillouin zone.

AB - In the rapidly expanding field of topological materials there is growing interest in systems whose topological electronic band features can be induced or controlled by magnetism. Magnetic Weyl semimetals, which contain linear band crossings near the Fermi level, are of particular interest owing to their exotic charge and spin transport properties. Up to now, the majority of magnetic Weyl semimetals have been realized in ferro- or ferrimagnetically ordered compounds, but a disadvantage of these materials for practical use is their stray magnetic field which limits the minimum size of devices. Here we show that Weyl nodes can be induced by a helical spin configuration, in which the magnetization is fully compensated. Using a combination of neutron diffraction and resonant elastic x-ray scattering, we find that below T N = 14.5 K the Eu spins in EuCuAs develop a planar helical structure which induces two quadratic Weyl nodes with Chern numbers C = ±2 at the A point in the Brillouin zone.

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SN - 2397-4648

VL - 9

JO - npj Quantum Materials

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ER -

Weyl metallic state induced by helical magnetic order

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