著者

藤代 有絵子 金澤 直也

出版者

日本中性子科学会

雑誌

波紋 (ISSN:1349046X)

巻号頁・発行日

vol.30, no.3, pp.144-148, 2020-08-10 (Released:2021-12-01)

参考文献数

23

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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.

著者

金澤 直也

出版者

上智大学イベロアメリカ研究所

雑誌

イベロアメリカ研究 (ISSN:03881237)

巻号頁・発行日

vol.31, no.1, pp.51-61, 2009