Topological Magnetic Phase Transitions Revealed by Neutron Scattering Experiment － From Skyrmion Lattice to Emergent Monopole Lattice －

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Other Title
  • 中性子で解き明かすトポロジカル磁気相転移
  • サイエンス記事 中性子で解き明かすトポロジカル磁気相転移 : スキルミオン格子から創発磁気モノポール格子へ
  • サイエンス キジ チュウセイシ デ トキアカス トポロジカル ジキソウ テンイ : スキルミオン ゴウシ カラ ソウハツ ジキ モノポール ゴウシ エ
  • －スキルミオン格子から創発磁気モノポール格子へ－

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Abstract

<p>We report topological magnetic phase transitions between skyrmion lattice state and hedgehog lattice state realized in cubic chiral magnets MnSi1-xGex. By performing small- and wide-angle neutron scattering experiments, we discover three different topological spin textures with variation of the lattice constant controlled by Si/Ge substitution: skyrmion lattice (x = 0-0.25) and two types of hedgehog lattices with four q-vectors (x = 0.4-0.6) and three q-vectors (x = 0.7-1.0). The variation of magnetic properties in MnSi1-xGex strongly suggests that short-period hedgehog lattices may be stabilized by conduction electron mediated exchange interactions, rather than Dzyaloshinskii-Moriya interaction. We also discuss some recent theoretical proposals concerning the stabilization mechanism of the hedgehog lattices, which are related to high-order exchange interactions.</p>

Journal

  • hamon

    hamon 30 (3), 144-148, 2020-08-10

    The Japanese Society for Neutron Science

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