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Phase transitions associated with magnetic-field induced topological orbital momenta in a non-collinear antiferromagnet

Author

Listed:
  • Sihao Deng

    (Chinese Academy of Sciences
    Karlsruhe Institute of Technology
    Spallation Neutron Source Science Center)

  • Olena Gomonay

    (Johannes Gutenberg Universität Mainz)

  • Jie Chen

    (Chinese Academy of Sciences
    Spallation Neutron Source Science Center)

  • Gerda Fischer

    (Karlsruhe Institute of Technology)

  • Lunhua He

    (Spallation Neutron Source Science Center
    Chinese Academy of Sciences
    Songshan Lake Materials Laboratory)

  • Cong Wang

    (Beihang University)

  • Qingzhen Huang

    (National Institute of Standards and Technology)

  • Feiran Shen

    (Chinese Academy of Sciences
    Spallation Neutron Source Science Center)

  • Zhijian Tan

    (Chinese Academy of Sciences
    Spallation Neutron Source Science Center)

  • Rui Zhou

    (Chinese Academy of Sciences)

  • Ze Hu

    (Renmin University of China)

  • Libor Šmejkal

    (Johannes Gutenberg Universität Mainz)

  • Jairo Sinova

    (Johannes Gutenberg Universität Mainz)

  • Wolfgang Wernsdorfer

    (Karlsruhe Institute of Technology
    Karlsruhe Institute of Technology)

  • Christoph Sürgers

    (Karlsruhe Institute of Technology)

Abstract

Resistivity measurements are widely exploited to uncover electronic excitations and phase transitions in metallic solids. While single crystals are preferably studied to explore crystalline anisotropies, these usually cancel out in polycrystalline materials. Here we show that in polycrystalline Mn3Zn0.5Ge0.5N with non-collinear antiferromagnetic order, changes in the diagonal and, rather unexpected, off-diagonal components of the resistivity tensor occur at low temperatures indicating subtle transitions between magnetic phases of different symmetry. This is supported by neutron scattering and explained within a phenomenological model which suggests that the phase transitions in magnetic field are associated with field induced topological orbital momenta. The fact that we observe transitions between spin phases in a polycrystal, where effects of crystalline anisotropy are cancelled suggests that they are only controlled by exchange interactions. The observation of an off-diagonal resistivity extends the possibilities for realising antiferromagnetic spintronics with polycrystalline materials.

Suggested Citation

  • Sihao Deng & Olena Gomonay & Jie Chen & Gerda Fischer & Lunhua He & Cong Wang & Qingzhen Huang & Feiran Shen & Zhijian Tan & Rui Zhou & Ze Hu & Libor Šmejkal & Jairo Sinova & Wolfgang Wernsdorfer & Ch, 2024. "Phase transitions associated with magnetic-field induced topological orbital momenta in a non-collinear antiferromagnet," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45129-x
    DOI: 10.1038/s41467-024-45129-x
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    References listed on IDEAS

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