Non-collinear stripe magnetic texture in the Weyl semimetal CeAlSi

ORAL

Abstract

CeAlSi is a non-centrosymmetric semimetal with electronic Weyl nodes lying close to its Fermi energy. The additional presence of magnetic Ce3+ ions allows the study of unique phenomena that couples transport, collective magnetism, and Weyl fermions in this material. In this talk, I will focus on presenting details of its collective magnetism, which we probed with single-crystal neutron diffraction and small-angle neutron scattering. We will describe its in-plane non-collinear spin structure that forms stripe magnetic domains. The distribution of domains within CeAlSi has an orthorhombic distribution, which we qualitatively understand using micro-magnetic calculations that incorporate exchange, crystal-field, dipolar, and Dzyaloshinskii-Moriya interactions.

* Neutron scattering was supported as part of the Institute for Quantum Matter, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award No. DE-SC0019331. This work was also supported by the Gordon and Betty Moore foundation under the EPIQS program GBMF9456. A portion of this research used resources at the High Flux Isotope Reactor and Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. Finally, we acknowledge the support of the National Institute of Standards and Technology, U.S. Department of Commerce.

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Publication: H-Y Yang et al., Phys. Rev. B 103, 115143 (2021)
J.Gaudet et al., Under preparation

Presenters

  • Jonathan Gaudet

    NIST Center for Neutron Research, Johns Hopkins University

Authors

  • Jonathan Gaudet

    NIST Center for Neutron Research, Johns Hopkins University

  • Hung-Yu Yang

    University of California, Los Angeles

  • Xiaohan Yao

    Boston College

  • Guangyong Xu

    National Institute of Standards and Tech

  • Yang Zhao

    University of Maryland, College Park

  • Collin L Broholm

    John Hopkins University, Johns Hopkins University

  • Fazel Tafti

    Boston College

  • Charlie Wu

    ANSTO