Park Pyeongjae, Park Kisoo, Oh Joosung, Lee Ki Hoon, Leiner Jonathan C, Sim Hasung, Kim Taehun, Jeong Jaehong, Rule Kirrily C, Kamazawa Kazuya, Iida Kazuki, Perring T G, Woo Hyungje, Cheong S-W, Zhitomirsky M E, Chernyshev A L, Park Je-Geun
Center for Quantum Materials, Seoul National University, Seoul, 08826, Republic of Korea.
Center for Correlated Electron Systems, Institute for Basic Science, Seoul National University, Seoul, 08826, Republic of Korea.
Nat Commun. 2021 Apr 16;12(1):2306. doi: 10.1038/s41467-021-22569-3.
Novel effects induced by nonmagnetic impurities in frustrated magnets and quantum spin liquid represent a highly nontrivial and interesting problem. A theoretical proposal of extended modulated spin structures induced by doping of such magnets, distinct from the well-known skyrmions has attracted significant interest. Here, we demonstrate that nonmagnetic impurities can produce such extended spin structures in h-YMnO, a triangular antiferromagnet with noncollinear magnetic order. Using inelastic neutron scattering (INS), we measured the full dynamical structure factor in Al-doped h-YMnO and confirmed the presence of magnon damping with a clear momentum dependence. Our theoretical calculations can reproduce the key features of the INS data, supporting the formation of the proposed spin textures. As such, our study provides the first experimental confirmation of the impurity-induced spin textures. It offers new insights and understanding of the impurity effects in a broad class of noncollinear magnetic systems.
受挫磁体和量子自旋液体中的非磁性杂质所引发的新奇效应是一个极具挑战性且有趣的问题。一种由这类磁体掺杂诱导产生的扩展调制自旋结构的理论设想，与著名的斯格明子不同，已引起了广泛关注。在此，我们证明非磁性杂质能够在h - YMnO（一种具有非共线磁序的三角反铁磁体）中产生此类扩展自旋结构。利用非弹性中子散射（INS），我们测量了Al掺杂h - YMnO中的全动态结构因子，并证实了磁振子阻尼具有明显的动量依赖性。我们的理论计算能够重现INS数据的关键特征，支持了所提出的自旋纹理的形成。因此，我们的研究首次通过实验证实了杂质诱导的自旋纹理。它为广泛的非共线磁系统中的杂质效应提供了新的见解和理解。
