Long-Wavelength Helimagnetic Order and Skyrmion Lattice Phase in Cu2OSeO3
Long-Wavelength Helimagnetic Order and Skyrmion Lattice Phase in Cu2OSeO3
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DOI：
10.1103/physrevlett.108.237204
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发表时间：
2012-06-08
影响因子：
8.6
通讯作者：
Pfleiderer, C.
中科院分区：
文献类型：
--
作者：
Adams, T.;Chacon, A.;Pfleiderer, C.
我们报告了铁磁绝缘体Cu2 OSeO3大块样品中的长波螺旋磁超结构。与从小角中子散射和磁化测量推断的螺旋磁调制相关的磁相图包括skyrmion晶格相，并且强烈地让人联想到MnSi、FeGe和Fe1-xCoxSi，即，Cu2OSeO3的二元同构兄弟，按螺旋磁序排列。的比热的温度依赖性的Cu2OSeO3是近临界的自旋波动的helmagnetic转变的特点。这提供了推定的证据，有效的自旋电流的起源磁介电响应的增强，而不是原子位移考虑到目前为止。
We report a long-wavelength helimagnetic superstructure in bulk samples of the ferrimagnetic insulator Cu2OSeO3. The magnetic phase diagram associated with the helimagnetic modulation inferred from small-angle neutron scattering and magnetization measurements includes a skyrmion lattice phase and is strongly reminiscent of MnSi, FeGe, and Fe1-xCoxSi, i.e., binary isostructural siblings of Cu2OSeO3 that order helimagnetically. The temperature dependence of the specific heat of Cu2OSeO3 is characteristic of nearly critical spin fluctuations at the helimagnetic transition. This provides putative evidence for effective spin currents as the origin of enhancements of the magnetodielectric response instead of atomic displacements considered so far.