Spin structure and dynamics of the topological semimetal Co3Sn2-xInxS2

Kelly J. Neubauer; Feng Ye; Yue Shi; Paul Malinowski; Bin Gao; Keith M. Taddei; Philippe Bourges; Alexandre Ivanov; Jiun Haw Chu; Pengcheng Dai

doi:10.1038/s41535-022-00523-w

Spin structure and dynamics of the topological semimetal Co₃Sn_2-xIn_xS₂

Kelly J. Neubauer, Feng Ye, Yue Shi, Paul Malinowski, Bin Gao, Keith M. Taddei, Philippe Bourges, Alexandre Ivanov, Jiun Haw Chu, Pengcheng Dai

Single Crystal Diffraction

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

The anomalous Hall effect (AHE), typically observed in ferromagnetic (FM) metals with broken time-reversal symmetry, depends on electronic and magnetic properties. In Co₃Sn_2-xIn_xS₂, a giant AHE has been attributed to Berry curvature associated with the FM Weyl semimetal phase, yet recent studies report complicated magnetism. We use neutron scattering to determine the spin dynamics and structures as a function of x and provide a microscopic understanding of the AHE and magnetism interplay. Spin gap and stiffness indicate a contribution from Weyl fermions consistent with the AHE. The magnetic structure evolves from c-axis ferromagnetism at x= 0 to a canted antiferromagnetic (AFM) structure with reduced c-axis moment and in-plane AFM order at x= 0.12 and further reduced c-axis FM moment at x= 0.3. Since noncollinear spins can induce non-zero Berry curvature in real space acting as a fictitious magnetic field, our results revealed another AHE contribution, establishing the impact of magnetism on transport.

Original language	English
Article number	112
Journal	npj Quantum Materials
Volume	7
Issue number	1
DOIs	https://doi.org/10.1038/s41535-022-00523-w
State	Published - Dec 2022

Bibliographical note

Publisher Copyright:
© 2022, The Author(s).

Funding

We wish to thank Ursula Bengaard Hansen and Paul Steffens for help and assistance for the Thales experiment. The neutron scattering and single crystal synthesis work at Rice is supported by US NSF-DMR-2100741 and by the Robert A. Welch Foundation under Grant No. C-1839, respectively (P.D.). The transport measurements at UW were supported by the Air Force Office of Scientific Research (AFOSR) under Award No. FA2386-21-1-4060 and the David Lucile Packard Foundation (J.H.C). A portion of this research used resources at the Spallation Neutron Source and the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by ORNL. We wish to thank Ursula Bengaard Hansen and Paul Steffens for help and assistance for the Thales experiment. The neutron scattering and single crystal synthesis work at Rice is supported by US NSF-DMR-2100741 and by the Robert A. Welch Foundation under Grant No. C-1839, respectively (P.D.). The transport measurements at UW were supported by the Air Force Office of Scientific Research (AFOSR) under Award No. FA2386-21-1-4060 and the David Lucile Packard Foundation (J.H.C). A portion of this research used resources at the Spallation Neutron Source and the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by ORNL.

Funders	Funder number
NSF-DMR-2100741
David and Lucile Packard Foundation
Air Force Office of Scientific Research	FA2386-21-1-4060
Welch Foundation	C-1839
Office of Science
Oak Ridge National Laboratory

Access to Document

10.1038/s41535-022-00523-w

Cite this

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title = "Spin structure and dynamics of the topological semimetal Co3Sn2-xInxS2",

abstract = "The anomalous Hall effect (AHE), typically observed in ferromagnetic (FM) metals with broken time-reversal symmetry, depends on electronic and magnetic properties. In Co3Sn2-xInxS2, a giant AHE has been attributed to Berry curvature associated with the FM Weyl semimetal phase, yet recent studies report complicated magnetism. We use neutron scattering to determine the spin dynamics and structures as a function of x and provide a microscopic understanding of the AHE and magnetism interplay. Spin gap and stiffness indicate a contribution from Weyl fermions consistent with the AHE. The magnetic structure evolves from c-axis ferromagnetism at x= 0 to a canted antiferromagnetic (AFM) structure with reduced c-axis moment and in-plane AFM order at x= 0.12 and further reduced c-axis FM moment at x= 0.3. Since noncollinear spins can induce non-zero Berry curvature in real space acting as a fictitious magnetic field, our results revealed another AHE contribution, establishing the impact of magnetism on transport.",

author = "Neubauer, {Kelly J.} and Feng Ye and Yue Shi and Paul Malinowski and Bin Gao and Taddei, {Keith M.} and Philippe Bourges and Alexandre Ivanov and Chu, {Jiun Haw} and Pengcheng Dai",

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AU - Ye, Feng

AU - Shi, Yue

AU - Malinowski, Paul

AU - Gao, Bin

AU - Taddei, Keith M.

AU - Bourges, Philippe

AU - Ivanov, Alexandre

AU - Chu, Jiun Haw

AU - Dai, Pengcheng

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AB - The anomalous Hall effect (AHE), typically observed in ferromagnetic (FM) metals with broken time-reversal symmetry, depends on electronic and magnetic properties. In Co3Sn2-xInxS2, a giant AHE has been attributed to Berry curvature associated with the FM Weyl semimetal phase, yet recent studies report complicated magnetism. We use neutron scattering to determine the spin dynamics and structures as a function of x and provide a microscopic understanding of the AHE and magnetism interplay. Spin gap and stiffness indicate a contribution from Weyl fermions consistent with the AHE. The magnetic structure evolves from c-axis ferromagnetism at x= 0 to a canted antiferromagnetic (AFM) structure with reduced c-axis moment and in-plane AFM order at x= 0.12 and further reduced c-axis FM moment at x= 0.3. Since noncollinear spins can induce non-zero Berry curvature in real space acting as a fictitious magnetic field, our results revealed another AHE contribution, establishing the impact of magnetism on transport.

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