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Topological Magnetic Phase in the Candidate Weyl Semimetal CeAlGe

Pascal Puphal, Vladimir Pomjakushin, Naoya Kanazawa, Victor Ukleev, Dariusz J. Gawryluk, Junzhang Ma, Muntaser Naamneh, Nicholas C. Plumb, Lukas Keller, Robert Cubitt, Ekaterina Pomjakushina, and Jonathan S. White
Phys. Rev. Lett. 124, 017202 – Published 7 January 2020
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Abstract

We report the discovery of topological magnetism in the candidate magnetic Weyl semimetal CeAlGe. Using neutron scattering we find this system to host several incommensurate, square-coordinated multi-k magnetic phases below TN. The topological properties of a phase stable at intermediate magnetic fields parallel to the c axis are suggested by observation of a topological Hall effect. Our findings highlight CeAlGe as an exceptional system for exploiting the interplay between the nontrivial topologies of the magnetization in real space and Weyl nodes in momentum space.

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  • Received 1 July 2019
  • Revised 1 November 2019

DOI:https://doi.org/10.1103/PhysRevLett.124.017202

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Pascal Puphal1,*, Vladimir Pomjakushin2, Naoya Kanazawa3, Victor Ukleev2, Dariusz J. Gawryluk1,‡, Junzhang Ma4, Muntaser Naamneh4, Nicholas C. Plumb4, Lukas Keller2, Robert Cubitt5, Ekaterina Pomjakushina1, and Jonathan S. White2,†

  • 1Laboratory for Multiscale Materials Experiments (LMX), Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland
  • 2Laboratory for Neutron Scattering and Imaging (LNS), Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland
  • 3Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
  • 4Swiss Light Source (SLS), Paul Scherrer Institute (PSI), CH-5232 Villigen PSI, Switzerland
  • 5Institut Laue-Langevin (ILL), 71 avenue des Martyrs, CS 20156, 38042 Grenoble cedex 9, France

  • *pascal.puphal@psi.ch
  • jonathan.white@psi.ch
  • On leave from Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02-668 Warsaw, Poland.

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Vol. 124, Iss. 1 — 10 January 2020

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